The original mode from the PS1 and the X68000 game are supposed to be exactly the same in gameplay terms, but after testing i can say it is not the case many ennemy placements who are normally supposed to be fixed are different between both version. I will do a video to show a few of them.

Video differences in level 1 :

0:08 Loadings times for PS1 0:38 Early bat for X68000 0:48 Faster panther for X68000 1:25 Different spawns of fishmans for X68000 1:56 Second bat come faster for X68000 2:09 The eye attack in a different direction and is much faster for X68000 2:27 The boss spawn faster for X68000 2:37 The energy ball of the boss appear faster and float for a shorter time for X68000