Yes, the wallets that have the same iteration are simply the same wallet hex edited over and over again with what ever public view key they desire on the same wallet they have made. Not changed in bitcoin core to give new string like you have done above.
Edit: The ones I show that are recurring would not surprise me if they all have the same password, my suspicions are that it is the same encrypted wallet but hex edited with different public keys and junk to show bank in them. This would not be done in the Core Wallet but in a hex editor.
Some wallets have never spend coins in them, soo the pubkey is not published in the blockchain, the old bitcoin2john scrypt decodes also the pub key from the wallet file, soo we could compare if the pubkey is the same in the wallets with the same iteration. Or somehow try to decode the pubkey from the hash
I like this idea too, have you got a link to the older version of the bitcoin2john scrypt? or you can paste it in here as a comment buddy