When you acquire a bank you acquire their BSA compliance effort, warts, exemptions, everything. If they are right, they're right. If they are wrong,.. There is no printed direction that they must be amended. However, if you do not amend them they will not be tied to your bank when examiners request a print out of your exempt customers and you will have to explain the discrepancy.
Amending them is fine and avoids a worthless conversation.
My suggestion is you do them over from scratch just to make certain they are right and that you have all the documentation you need.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.