Is it okay to replace Financing choice on a short sale.

[Jacob Koshy]

I have an accepted offer for a bank short sale in the SW suburbs of Chicago. When I initially made the offer I put in the financing conditions based on my pre approval. Which is with a 25% down payment. While I was waiting to hear back from the bank I was able research and get pre approval with only a 15% down payment. Now what can I do if any, to get the bank to agree to my 15% down option. Would it be a hassle and scare away the bank or what have your experience been. Thank you.