I just bought a boa but don't have anothr tank so I have no choice of putting it in the same tank as my king snake they are both females would they fight?

NO! They will fight for territory. King snakes eat other snakes.

Yes they would fight! I had both of them and the king snake ate the boa snake.

They won't fight. The boa will be digested.King snakes are very quick to swallow other snakes... head first! Go to a garage sale and but a used aquarium. Until then keep it in a totes container,white / light so light gets into it