They are different enough that it's frankly a bit difficult to make sense of that question. I think in general, when asking "what is the difference between X and Y" questions, it helps if you elaborate a bit on why you think X and Y are similar / difficult to distinguish. That gives the person who answers the question a bit of a starting point: they can talk how the similarities you perceive might not be the whole story, or might be illusory (and you might end up answering your own question while clarifying your thoughts on the matter). Otherwise it might not be clear how to even begin answering the question.