diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 3e4e288e143a3..d7f0f1184a7e6 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -8457,24 +8457,31 @@ class Sema final {
     /// template<int Value> struct integer_c;
     /// X<integer_c> xic;
     /// \endcode
-    TPL_TemplateTemplateArgumentMatch
+    TPL_TemplateTemplateArgumentMatch,
+
+    /// We are determining whether the template-parameters are equivalent
+    /// according to C++ [temp.over.link]/6. This comparison does not consider
+    /// constraints.
+    ///
+    /// \code
+    /// template<C1 T> void f(T);
+    /// template<C2 T> void f(T);
+    /// \endcode
+    TPL_TemplateParamsEquivalent,
   };
 
   bool TemplateParameterListsAreEqual(
       const NamedDecl *NewInstFrom, TemplateParameterList *New,
       const NamedDecl *OldInstFrom, TemplateParameterList *Old, bool Complain,
       TemplateParameterListEqualKind Kind,
-      SourceLocation TemplateArgLoc = SourceLocation(),
-      bool PartialOrdering = false);
+      SourceLocation TemplateArgLoc = SourceLocation());
 
   bool TemplateParameterListsAreEqual(
       TemplateParameterList *New, TemplateParameterList *Old, bool Complain,
       TemplateParameterListEqualKind Kind,
-      SourceLocation TemplateArgLoc = SourceLocation(),
-      bool PartialOrdering = false) {
+      SourceLocation TemplateArgLoc = SourceLocation()) {
     return TemplateParameterListsAreEqual(nullptr, New, nullptr, Old, Complain,
-                                          Kind, TemplateArgLoc,
-                                          PartialOrdering);
+                                          Kind, TemplateArgLoc);
   }
 
   bool CheckTemplateDeclScope(Scope *S, TemplateParameterList *TemplateParams);
diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index f1de491f1cd33..4a667d046f149 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -7967,8 +7967,7 @@ Sema::BuildExpressionFromIntegralTemplateArgument(const TemplateArgument &Arg,
 static bool MatchTemplateParameterKind(
     Sema &S, NamedDecl *New, const NamedDecl *NewInstFrom, NamedDecl *Old,
     const NamedDecl *OldInstFrom, bool Complain,
-    Sema::TemplateParameterListEqualKind Kind, SourceLocation TemplateArgLoc,
-    bool PartialOrdering) {
+    Sema::TemplateParameterListEqualKind Kind, SourceLocation TemplateArgLoc) {
   // Check the actual kind (type, non-type, template).
   if (Old->getKind() != New->getKind()) {
     if (Complain) {
@@ -8056,11 +8055,12 @@ static bool MatchTemplateParameterKind(
             (Kind == Sema::TPL_TemplateMatch
                  ? Sema::TPL_TemplateTemplateParmMatch
                  : Kind),
-            TemplateArgLoc, PartialOrdering))
+            TemplateArgLoc))
       return false;
   }
 
-  if (!PartialOrdering && Kind != Sema::TPL_TemplateTemplateArgumentMatch &&
+  if (Kind != Sema::TPL_TemplateParamsEquivalent &&
+      Kind != Sema::TPL_TemplateTemplateArgumentMatch &&
       !isa<TemplateTemplateParmDecl>(Old)) {
     const Expr *NewC = nullptr, *OldC = nullptr;
 
@@ -8153,8 +8153,7 @@ void DiagnoseTemplateParameterListArityMismatch(Sema &S,
 bool Sema::TemplateParameterListsAreEqual(
     const NamedDecl *NewInstFrom, TemplateParameterList *New,
     const NamedDecl *OldInstFrom, TemplateParameterList *Old, bool Complain,
-    TemplateParameterListEqualKind Kind, SourceLocation TemplateArgLoc,
-    bool PartialOrdering) {
+    TemplateParameterListEqualKind Kind, SourceLocation TemplateArgLoc) {
   if (Old->size() != New->size() && Kind != TPL_TemplateTemplateArgumentMatch) {
     if (Complain)
       DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind,
@@ -8186,7 +8185,7 @@ bool Sema::TemplateParameterListsAreEqual(
 
       if (!MatchTemplateParameterKind(*this, *NewParm, NewInstFrom, *OldParm,
                                       OldInstFrom, Complain, Kind,
-                                      TemplateArgLoc, PartialOrdering))
+                                      TemplateArgLoc))
         return false;
 
       ++NewParm;
@@ -8203,7 +8202,7 @@ bool Sema::TemplateParameterListsAreEqual(
     for (; NewParm != NewParmEnd; ++NewParm) {
       if (!MatchTemplateParameterKind(*this, *NewParm, NewInstFrom, *OldParm,
                                       OldInstFrom, Complain, Kind,
-                                      TemplateArgLoc, PartialOrdering))
+                                      TemplateArgLoc))
         return false;
     }
   }
@@ -8217,7 +8216,8 @@ bool Sema::TemplateParameterListsAreEqual(
     return false;
   }
 
-  if (!PartialOrdering && Kind != TPL_TemplateTemplateArgumentMatch) {
+  if (Kind != TPL_TemplateTemplateArgumentMatch &&
+      Kind != TPL_TemplateParamsEquivalent) {
     const Expr *NewRC = New->getRequiresClause();
     const Expr *OldRC = Old->getRequiresClause();
 
diff --git a/clang/lib/Sema/SemaTemplateDeduction.cpp b/clang/lib/Sema/SemaTemplateDeduction.cpp
index 1fe2d3fac6859..611ebc9859388 100644
--- a/clang/lib/Sema/SemaTemplateDeduction.cpp
+++ b/clang/lib/Sema/SemaTemplateDeduction.cpp
@@ -5279,8 +5279,8 @@ FunctionTemplateDecl *Sema::getMoreSpecializedTemplate(
   //   function parameters that positionally correspond between the two
   //   templates are not of the same type, neither template is more specialized
   //   than the other.
-  if (!TemplateParameterListsAreEqual(
-          TPL1, TPL2, false, Sema::TPL_TemplateMatch, SourceLocation(), true))
+  if (!TemplateParameterListsAreEqual(TPL1, TPL2, false,
+                                      Sema::TPL_TemplateParamsEquivalent))
     return nullptr;
 
   for (unsigned i = 0; i < NumParams1; ++i)
@@ -5637,8 +5637,8 @@ getMoreSpecialized(Sema &S, QualType T1, QualType T2, TemplateLikeDecl *P1,
   // function parameters that positionally correspond between the two
   // templates are not of the same type, neither template is more specialized
   // than the other.
-  if (!S.TemplateParameterListsAreEqual(
-          TPL1, TPL2, false, Sema::TPL_TemplateMatch, SourceLocation(), true))
+  if (!S.TemplateParameterListsAreEqual(TPL1, TPL2, false,
+                                        Sema::TPL_TemplateParamsEquivalent))
     return nullptr;
 
   if (!TemplateArgumentListAreEqual(S.getASTContext())(P1, P2))