RetroGaming

Hey, you're playing a game from almost 30 years ago!

The data is actually exactly the same as what would be on a cartridge. The same way you can use a .gb file from the 90s, you can use a .sav file from the 90s too. Emulators were made to read those original files, not the other way around. Every GB emulator should have no problem reading those files.

Now save states is where you'll run into trouble. Those are unique to the emulators, since the consoles never had them, meaning each emulator had to create them from scratch. You might find some cross compatibility, but generally not, I'd think.

This should generally be true for most emulators. And for most consoles themselves, actually -- you could run most ROMs from a console and even .sav files between emulators and consoles! (e.g., with an EverDrive)

yes, even 11 years ago. it is dumping the ram state of the emulated processor and game state not of the emulator on it's host system. There may be different header data or something that could cause problems but realistically all .sav's really should be the same.