You won't really know. if they are duplicates or not. Due to privacy settings you won't see much info
1. Names are the same
2. same profile managers
3. Both profiles came from the same gedcom
3. The manager will decide if they are duplicates.
4. If after 30 days the manager doesn't approve the merge 30 day default approval will result.
5. A sys/op will have to decide whether to reject or merge them if needed.
So, it doesn't hurt to propose the merge. In this case only the manager or a sys/op will be able to complete merge.