Apocalypse let you save to the SD on saves 2-5 in the cart version. So if ill buy the digital version and save on save 2 will the cart version will read the save or like other games the saves not compatible?
I just checked; my physical Apocalypse cart read my SMT4 saves off the SD card just fine. I'm not sure what you mean by "saves 2-5", though, because neither my physical SMT4 cart nor the digital version has more than 2 save slots, and both save slots are most definitely on the cartridge. The only Atlus game I know of with saves both on cartridge and SD card is Persona Q. Is this something from the European or Japanese versions?