I recently got a 190-in-1 multicart (as well as another one and The General's Son
) and one thing I found pretty quickly, other than Adventure Island being called Atlantis on the menu for some crazy reason, is that there appears to have been a third version of MJ. I suspect this one was developed between the original and MJ2. When compared with the original, the title screen was replaced with the menu from MJ2 (except the option to change the pieces is a 2 player option instead), there's only one song in the game (I think, at least) and the background was changed to what I think is Moscow, kind of like the one from BPS' awful Tetris port. Also, the one song that plays in the game was the one from level 7 of the original.
I doubt there was a single cart release of this version, and it might be worth pointing out that the multicart menu uses the same graphics as the menu from the game. Oh, and neither Hwang Shinwei or RCM are credited anywhere.