Find-MgGraphPermission has two parameter sets. -All and -SearchString are in separated sets.
Find-EntraPermission has only one parameter set. A user can tab-complete -SearchString and -All, try to use them both, and command will fail at the runtime.
PS> Find-EntraPermission -SearchString "user.read" -All
Find-MgGraphPermission: Parameter set cannot be resolved using the specified named parameters. One or more parameters issued cannot be used together or an insufficient number of parameters were provided.