Did US gtv6s have cats that long ago? Looks like different sections of the exhaust have just been renewed at different times with different parts. Maybe a PO has replaced a part of the system with a milano part? Either way, seems like a good excuse for a nice fresh system!
It appears that one of these is a Euro down pipe with it's small muffler. The other is a small replacement muffler in the Euro pipe. As several others have indicated, they are not Cats and probably should be replaced.