Hi Julie, WikiTree doesn't allow us to delete profiles, instead you merge it to the other profile and then clean up the narrative afterwords.
Looks like you already compared the two, so go ahead and continue the process of merging them. Comparing Lennon-647 (L) and Lennon-381
The next step is to wait for the profile manager of Lennon-381 to approve the merge. (You may want to email her and let her know its a duplicate and why it is one while you wait for approval).