On xbox can you save a world of MineCraft onto another account on the same xbox?

Not with Just the xbox alone, you need a PC to do it. If you want to figure out how, just look up "How to download Custom maps on Minecraft Xbox" Then instead of downloading the map, you use the map you want to change to the other account. The reason you need to do this is because you need to be play the map on the other account, but if you copy/paste that map into your other account (Which I don't think is possible in the first place), then it would think that the account you made the world on is the OG account, therefore it is incompatible with the other account you want to play it on. So, when you do the PC process, you make it think that you're account is the account it was made on, therefore it would make it compatible.