Quick answers to your questions, Charles:
- Resolve "overlap" (also known as "same person") by merging.
- Yes, apparently they are the same person!!
One point to note on merges is that while the merged-away profile's WikiTree-ID will no longer show as the ID in a profile's URL (could I possibly state this more confusingly?), the merged-away profile's WikiTree-ID (repeated text for clarity) still may be coded on other profile pages.