i am gonna elaborate on my answer
they usually don't have stuff like the intellectual propriety of the developers, i mean like music, art, videos etc, textures, code of the game, or designed maps.
they USUALLY only have stored info about what you unlocked, stats, stuff that you got, your location and plenty of other stuff that are related to your progress..
sharing game saves had always been allowed in all places.. i don't see why it should make a problem, unless for some weird reason the developers programmed the game in a way that would store complete stuff from the rom into the save, instead of where you are and where is stuff, what you defeated and etc in that map.