You cannot swap out the wallet or import any keys if you have pruning enabled. Pruning ensures that Bitcoin Core only keeps what is necessary and pertaining to the wallet that was loaded during synchronization. If you want to use both wallets interchangeably and swap them out without a reindex, you have to disable pruning.
Well you have given me some hope this isn't a catastrophe..... I am re-synching again, with pruning off. It takes a while but no big deal.
Thank you for the response. I am new to this..... so I don't have the in-depth experience to troubleshoot.
Have a great day!