The US iTunes store has more, I checked a couple of albums like Eminems clean song versions they on US but nothing on SA.
Also a couple others albums if I remember but not enough to justify $10pm.
If you signup with Apple Music using the SA iTunes account then like me login with any other account , it'll remove all your music.
I tried restarting the phone after signing back in with SA account, resyncing with iTunes on Macbook and even restored from backup, nothing brought the music back.
Very silly of Apple when we sign in to App store, it should not sign out the apple ID used in Apple Music. There should be some segregation between App store and Apple Music apps. or else each time I switch an App store ID, 600 - 700 songs downloads again...again... and again ...
If they allow that, what stops someone from using an Apple Music subscriber's id to log in and listen to music without paying especially if one of the people is supposed to be in the U.S and the other in S.A. I also have 2 accounts and I downloaded something from the U.S. store and have to wait for 90 days before I use the S.A Apple Music.