Most of these games are HACKS, not bad dumps, so why do they need to be redumped if they're good dumps of hacked version of the games?
Donkey Kong 5 isn't a hack of Donkey Kong Land 2 (Game Boy, not NES), but an original port of Donkey Kong Country 3 (SNES) that has nothing to do with the official version, Donkey Kong Land 3.
That glitch in Harry Potter probably happens on real hardware, but I don't have the game yet, so I'm not sure, but it's very likely.