Revision of TDS return - implication on form 16a

My Client had incurred an expense in Jan 2011 but payment is made in september 2011. This expense is not accounted in his books. Now TDS is deducted for that expense. SO the TDS return made for the Quarter 4 of FY 2010-11 has to be revised. But this would lead to change in acknowlegement number of the TDS return already filed. Now this number is mentioned on the TDS certificates already issued. So if the number changes after making revised return will it make any difference?