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You could apply both to separate files, then generate a patch in a version-indifferent format. I'm not sure if you would get better results applying base > xDelta Ribbit > HgPatcher co-op or base > xDelta co-op > HgPatcher Ribbit, and if neither work you're pretty much out of luck without refactoring the code yourself.
Using HgExport (link above) as "Run other script" in UndertaleModTool, create a patch that would upgrade from the base game (as "vanilla") to, uh, the co-op game (as "modded"). Make a new folder for the patch directory.
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