Cheating is cheating. You might tell yourself right after you look at the other person’s answer that you were going to write the same thing so therefore its not cheating. But that’s not true. You are just looking for ways to make your act seem better than what it really is. The fact that you looked at the other person’s paper means that you let your yetzer hara get to you and now your yetzer hara is just scheming reasons for why it was okay to do what you just did.
Control yourself and belief in yourself that you know the right answer. Otherwise, just study harder next time.