The checksum isn't the problem, the problem is twofold really: the multicart mapper isn't emulated in anything (as far as I know), plus the only dump I can find "1993 Collection 128-in-1 (Unl) [b1].gb" only contains the menu, not the actual game ROMs. So the ROM would have to be redumped plus the mapper emulated. Honestly don't hold your breath though, as far as I know the only people working on bootleg GB mappers at all are me and the MAME team, and I can't speak for them but a multicart full of games that are already dumped separately isn't a big priority for me really