I just got Sonic Jam for Saturn yesterday and looking through the memoribilia section I noticed that they always had the cover art for the SMS Sonic games lumped in with the Game Gear Sonic games and that the release dates seemed to follow the Game Gear releases more closely than the Genny/MD releases. To me this kind of implied that the SMS Sonic games aren't ports of the Genny/MD games so much as they are ports of the Game Gear games. Is this a correct assumption? Also, how close are the games to the Genny/MD versions?