Even in the cartridge days, game-devs still worked on patches and improvements for later publishing runs, so there can be many different versions of a cartridge game - and maybe the devs might have had even more recent builds of games that never got published because the publisher ended the run - so it's odd for Nintendo to go for the 'easy' route of repackaging an arbitrary version found online, compared to going through their own archives for something more recent, and presumably, of higher quality.