diff --git a/packages/flutterfire_cli/lib/src/commands/config.dart b/packages/flutterfire_cli/lib/src/commands/config.dart
index e01fa069..0cfaf8a6 100644
--- a/packages/flutterfire_cli/lib/src/commands/config.dart
+++ b/packages/flutterfire_cli/lib/src/commands/config.dart
@@ -108,10 +108,6 @@ class ConfigCommand extends FlutterFireCommand {
     return argResults!['out'] as String;
   }
 
-  String get appIDFilePath {
-    return 'firebase_app_id_file.json';
-  }
-
   String get iosAppIDOutputFilePrefix {
     return 'ios';
   }
@@ -120,6 +116,10 @@ class ConfigCommand extends FlutterFireCommand {
     return 'macos';
   }
 
+  String get androidAppIDOutputFilePrefix {
+    return 'android';
+  }
+
   Future<FirebaseProject> _promptCreateFirebaseProject() async {
     final newProjectId = promptInput(
       'Enter a project id for your new Firebase project (e.g. ${AnsiStyles.cyan('my-cool-project')})',
@@ -300,8 +300,8 @@ class ConfigCommand extends FlutterFireCommand {
     if (iosOptions != null) {
       final appIDFile = FirebaseAppIDFile(
         iosAppIDOutputFilePrefix,
-        appIDFilePath,
-        iosOptions.appId,
+        appId: iosOptions.appId,
+        firebaseProjectId: iosOptions.projectId,
       );
       futures.add(appIDFile.write());
     }
@@ -309,8 +309,17 @@ class ConfigCommand extends FlutterFireCommand {
     if (macosOptions != null) {
       final appIDFile = FirebaseAppIDFile(
         macosAppIDOutputFilePrefix,
-        appIDFilePath,
-        macosOptions.appId,
+        appId: macosOptions.appId,
+        firebaseProjectId: macosOptions.projectId,
+      );
+      futures.add(appIDFile.write());
+    }
+
+    if (androidOptions != null) {
+      final appIDFile = FirebaseAppIDFile(
+        androidAppIDOutputFilePrefix,
+        appId: androidOptions.appId,
+        firebaseProjectId: androidOptions.projectId,
       );
       futures.add(appIDFile.write());
     }
diff --git a/packages/flutterfire_cli/lib/src/firebase/firebase_app_id_file.dart b/packages/flutterfire_cli/lib/src/firebase/firebase_app_id_file.dart
index 69d3194f..f1dbfe20 100644
--- a/packages/flutterfire_cli/lib/src/firebase/firebase_app_id_file.dart
+++ b/packages/flutterfire_cli/lib/src/firebase/firebase_app_id_file.dart
@@ -25,8 +25,17 @@ import 'package:path/path.dart';
 import '../common/exception.dart';
 import '../common/utils.dart';
 
+const _defaultAppIdFileName = 'firebase_app_id_file.json';
+const _keyGoogleAppId = 'GOOGLE_APP_ID';
+const _keyFirebaseProjectId = 'FIREBASE_PROJECT_ID';
+
 class FirebaseAppIDFile {
-  FirebaseAppIDFile(this.outputDirectoryPath, this.fileName, this.appId);
+  FirebaseAppIDFile(
+    this.outputDirectoryPath, {
+    required this.appId,
+    required this.firebaseProjectId,
+    this.fileName = _defaultAppIdFileName,
+  });
 
   final StringBuffer _stringBuffer = StringBuffer();
 
@@ -35,23 +44,35 @@ class FirebaseAppIDFile {
   final String fileName;
 
   final String appId;
+  final String firebaseProjectId;
 
   Future<void> write() async {
-    // ignore: avoid_slow_async_io
-    final directoryExists = await Directory(outputDirectoryPath).exists();
-    if (!directoryExists) {
+    if (!Directory(outputDirectoryPath).existsSync()) {
       throw PlatformDirectoryDoesNotExistException(outputDirectoryPath);
     }
+
     final appIDFilePath = joinAll([outputDirectoryPath, fileName]);
     final outputFile = File(joinAll([Directory.current.path, appIDFilePath]));
+
     if (outputFile.existsSync() && !isCI) {
-      final shouldOverwrite = interact.Confirm(
-        prompt:
-            'Generated FirebaseAppID file ${AnsiStyles.cyan(appIDFilePath)} already exists, do you want to override it?',
-        defaultValue: true,
-      ).interact();
-      if (!shouldOverwrite) {
-        throw FirebaseAppIDAlreadyExistsException(appIDFilePath);
+      final existingFileContents = await outputFile.readAsString();
+      final existingFileContentsAsJson =
+          json.decode(existingFileContents) as Map;
+      final existingAppId =
+          existingFileContentsAsJson[_keyGoogleAppId] as String;
+      final existingFirebaseProjectId =
+          existingFileContentsAsJson[_keyFirebaseProjectId] as String;
+      // Only prompt overwrite if values are different.
+      if (existingAppId != appId ||
+          existingFirebaseProjectId != firebaseProjectId) {
+        final shouldOverwrite = interact.Confirm(
+          prompt:
+              'Generated FirebaseAppID file ${AnsiStyles.cyan(appIDFilePath)} already exists (for app id "$existingAppId" on Firebase Project "$existingFirebaseProjectId"), do you want to override it?',
+          defaultValue: true,
+        ).interact();
+        if (!shouldOverwrite) {
+          throw FirebaseAppIDAlreadyExistsException(appIDFilePath);
+        }
       }
     }
     _writeHeaderAndAppID(outputFile.path);
@@ -61,9 +82,11 @@ class FirebaseAppIDFile {
   void _writeHeaderAndAppID(String outputFile) {
     final fileData = {
       'file_generated_by': 'FlutterFire CLI',
-      'purpose': 'FirebaseAppID for this Firebase app in this directory',
-      'GOOGLE_APP_ID': appId
+      'purpose':
+          'FirebaseAppID & ProjectID for this Firebase app in this directory',
+      _keyGoogleAppId: appId,
+      _keyFirebaseProjectId: firebaseProjectId,
     };
-    _stringBuffer.write(json.encode(fileData));
+    _stringBuffer.write(const JsonEncoder.withIndent('  ').convert(fileData));
   }
 }
diff --git a/packages/flutterfire_cli/lib/src/firebase/firebase_configuration_file.dart b/packages/flutterfire_cli/lib/src/firebase/firebase_configuration_file.dart
index 787586b9..a20e6e8f 100644
--- a/packages/flutterfire_cli/lib/src/firebase/firebase_configuration_file.dart
+++ b/packages/flutterfire_cli/lib/src/firebase/firebase_configuration_file.dart
@@ -48,18 +48,26 @@ class FirebaseConfigurationFile {
 
   Future<void> write() async {
     final outputFile = File(joinAll([Directory.current.path, outputFilePath]));
+
+    // Write buffer early so we can string compare contents if file exists already.
+    _writeHeader();
+    _writeClass();
+    final newFileContents = _stringBuffer.toString();
+
     if (outputFile.existsSync() && !isCI) {
-      final shouldOverwrite = interact.Confirm(
-        prompt:
-            'Generated FirebaseOptions file ${AnsiStyles.cyan(outputFilePath)} already exists, do you want to override it?',
-        defaultValue: true,
-      ).interact();
-      if (!shouldOverwrite) {
-        throw FirebaseOptionsAlreadyExistsException(outputFilePath);
+      final existingFileContents = await outputFile.readAsString();
+      // Only prompt overwrite if contents have changed.
+      if (existingFileContents != newFileContents) {
+        final shouldOverwrite = interact.Confirm(
+          prompt:
+              'Generated FirebaseOptions file ${AnsiStyles.cyan(outputFilePath)} already exists, do you want to override it?',
+          defaultValue: true,
+        ).interact();
+        if (!shouldOverwrite) {
+          throw FirebaseOptionsAlreadyExistsException(outputFilePath);
+        }
       }
     }
-    _writeHeader();
-    _writeClass();
     outputFile.writeAsStringSync(_stringBuffer.toString());
   }