If not played in Easy mode, the Origins versions on the PSX were virtually the same game, save for a few extra cutscenes which certainly don't affect the game's difficulty. The game's interface was simply tweaked so that it didn't quite play like sailing down a river of diarrhea in the same way as the NES version did. The only thing making the game easier is a bunch of options you can either switch off, or just not use at all. Sorted.

The DoS version was too easy though: I mean, it's the only version I ever actually completed so it must have been too easy :)