There are multiple parts to this:

• Implement API diff for our .NET assemblies, like we have it for our old-style assemblies.
• Implement an API comparison between the .NET assemblies and the old style Xamarin assemblies.
• Implement an API comparison between iOS and Mac Catalyst API
  • Legacy
  • [dotnet] todo

The last part is only applicable to the first stable release, while the first part applies to any subsequent stable releases.