I would consider this a counteroffer because the applicant has requested an additional amount based on the same rate, but you are not able to offer the new amount at that rate. As a result, you will be countering their request with a higher rate. I believe you would also have a changed circumstance (borrower requested change) and a new LE would be required. Note if the applicant does not accept the counteroffer then a adverse action would be required if it was not included with the counteroffer.