I don't see where we got so screwed on Alpha 3, but okay...
Japan got SFZ3 for DC, PSX, Saturn and GBA. The US got SFA3 for DC, PSX and GBA. The exact same versions. I own both PSX versions, the DC version (which is not SFZ3 Upper, but is called "Saikyo Dojo") and the GBA version which is "Upper."
The Saturn version is very nice with it's 4-Meg cart support/requirement, but uncommon and therefore expensive. I shoulda bought one back in the day, but the DC got my gaming dollar then.

The PSX version was damn nice for a PSX version of a Street Fighter game, totally unlike the horrible PSX SFA2. It lost just a bit of animation, and the more elaborate intro/win sequences, but was pretty dead on playwise.
The DC version was like the PSX version with arcade perfect everything and all the secrets already unlocked. Nice.

The GBA version is missing 2 buttons, and kinda sucks.

To me it looks like Capcom just did what they usually do, streeeeeeeeeetch a game out, such as "Street Fighter 2 Turbo Champion Edition Hyper Fighting" and "Street Fighter Zero 2 Alpha."
