If you find a 2GB–6GB file labeled Donkey Kong Bananza NSP Full today, it is 99.9% likely to be fake, a virus, or a mislabeled ROM hack of Super Mario Odyssey.
If your interest is in playing Donkey Kong, I recommend purchasing the game through official Nintendo channels or looking into classic game collections that might be available on the Nintendo Switch eShop or other digital stores. For specific NSP file queries, ensure you're using trusted sources to avoid any risks. donkey kong bananza nsp full