Later on in the linked thread, the original poster seems to indicate that it doesn't appear to be the same emulator - or at least that the big chunk of code for

Later on in the linked thread, the original poster seems to indicate that it doesn't appear to be the same emulator - or at least that the big chunk of code for the controller mapping isn't retained in Donkey Kong 64. Perhaps they did a quick port or trimmed the emulator to fit the requirements of that specific game.