If such is observed then there can be some problem of discrepancy. I would recommend you to contact the authority under which the counselling is to be held and get this discussed. They will be able to give you the proper official procedure regarding this.

When you have filled the form then you will find that a term is always mentioned that for any discrepancy of information the application will be cancelled.

So I hope you can think how important it is. Don't wait for a while and contact the counselling authority.

I hope my answer helps. All the very best for your future endeavors!