24 bit monster HP patch

Oh yeah, this is definitely NOT compatible with the GBA rom. They're completely different blocks of code, although most of the data structures will be similar. Most of the forum is dedicated to hacking the original SNES version, although you'll find a few projects around that look at GBA (and a couple newer people who are interested in hacking the Steam release).

But yeah, what a patch like this does is just replace one block of code with another, and since the SNES and GBA versions run on different base code -- SNES is 65816 assembly, and I believe GBA is ARM? -- a patch like this isn't going to be directly compatible.