同じぐらいです (Almost similar)！"かもしれない" is the informal of "かもしれません"。"かも" is just the shorter way of saying "かもしれない". So, both of these are informal words and "かもしれません" is just the formal way of saying it. Hope you understood my answer!　頑張ってくださいね！

I suppose they are the same :)