When you first create a MetaMask wallet, it is also possible to add on more wallet addresses by pressing Create Account, so that your MetaMask has Wallet #1, Wallet #2 and so on. All of these wallets therefore will have the exact same seed phrase because they were spawned in the same MetaMask.
Is there anything on Etherscan or the Ethereum blockchain that indicates that Wallet address #2 was spawned are was created in the same MetaMask extension as Wallet address #1? and that they have, and belong to, the exact same seed phrase?