Well, the name of the "real" account is "zkevm.dev", and the previous account was zk-evm. Those are just letters to me, but it does seem like a clear link. Couldn't say that either is "real", though.
It is not. zk-evm refers to a type of blockchain. It's not a unique/singular link.
"zkevm.dev" is his domain, he uses it for email on all 3 accounts.
The account had a link to a personal website, that (for now) has links to a few social medias and the "real" account.