That is interesting, the fact that the Genesis and SNES versions feature different games. That is what I call a true multiplatform release. Most of the time companies skimp out and simply use as much as possible between ports, kind of taking the fun out of arguing which console is better.
Seriously though, that is a cool fact and a good reason to pick up both releases. I would not have thought Konami would have done that.
They were both released at the same time too so they had to have been developed simultaneously. I wonder if the reason they did it the way they did is because it was in some way a requirement that was part of the terms of the license...
That could definitely be part of it. Maybe the license reqiured so many mini games or something, or required each licensed character to be featured in a game that was beneficial to their image/abilities. If so, the number of games was probably too big for one cartridge on either platform at the time (Konami was known for skimping on memory on the SNES).
I like to think they had competing development teams working on this license, one for each platform, and they got to pick back and forth what mini games they wanted. Competing development teams internally is, or was, big in Japanese companies. Look at how close we came to not getting the Game Boy because of internal development teams fighting each other to push their work over another team's efforts.