@casey72's question essentially asks whether the identity of the buyer changes as a result of the acquisition, i.e., is the buyer after acquisition not the same as the buyer before the acquisition. In a stock acquisition, the buyer after the acquisition is the same as the buyer before the acquisition. The first place to look for confirmation is whether the buyer's EIN changed as a result of the acquisition.
Going back to the OP and @CuseFan's first comment, you can get to where you want to go by completing the stock acquisition and the buyer can merge the two plans without violating any successor plan rules. Why keep harping on a termination of either plan unless for some reason the buyer wants to use the acquisition as an excuse to take distributions now from the buyer's plan? The successor plan rules are there to discourage plans trying to skirt distribution and withdrawal restrictions by using a terminate-distribute-reestablish strategy.
Some things are clever, and some things are too clever.