The different Lender IDs shouldn't be a problem, kmenard. We ended up with 2 different IDs from the same vendor for months after a 2011 merger, and the vendor was willing to work with us to make sure the descriptive text associated with each ID was what we wanted it to be. Now we're merging again, and get to go through the process one more time.
Also no audit feedback regarding the numbers, as long as we had the flood determination pulled (and signed when necessary).
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Opinions or attitudes are mine, not those of my employer.