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If all you wanted was to replace the graphics of an enemy with ones from a different game it probably would be fairly easy, replacing the gfx, palettes, and sprite file should be pretty much all you'd have to do. Might need to make some changes to the sprite.Yeah, I know it wouldn't be as easy as just replacing their graphics, but many enemies are shared between the three games or appeared in at least two of them, like Forenus.
But replacing the AI too would be harder. You could copy the bytecode from one game to the other game as a start, but there's no way it would just work, you'd need to make a lot of modifications to the asm code for it to work. Namely you would need to look through every line to find all the places the AI calls a function outside of its own code, and then replace that so it instead calls whatever the equivalent function was in the game you're porting it to. The hardest part is finding these equivalent functions, there's no easy list of every function, so you'd need to look at other enemies who do similar things for reference and see what functions they call.