When asking this type of question, we should be careful and sensitive about the language we use. Most people will become offended at the suggestion that they may be wrong. So, if possible, avoid using the word 'wrong'.
With regard to your two suggestions, you could certainly say the first, whereas the second should be “Could you be wrong?”
I would favour “Are you sure?”, or “Is that definitely right?”
How you decide to phrase this depends on how well you know the person and how much you want to risk offending them.
Hope this helps.