The following can be done manually or scripted:
Go to a layout based on the target table (the table to receive the imported data)
Show All Records
Do an Import Records, specify the Match Found Set option and include the "add non matching as new records" option. Map the ID field as the Matching field for this import.
After the Import, do a Show Omitted Only and delete the found set. (Delete all Records is what they named this script step.)
Thank you PhilModJunk. This worked fine. I also reviewed your post of Feb 20 2014 which was related, and that helped a lot too. Thanks again.