0x, one per index.
The network is not part of the key. Your Ethereum address and your Polygon address are the same
string, and the balance you see depends only on which network the wallet is pointed at. So an
imported EVM wallet showing nothing is almost always the network selector, not the phrase — check
that before anything else.
The index
{index} is the address leaf, so all your EVM wallets sit under one account, m/44'/60'/0'. This is
also how account numbering works in a standard wallet, so the mapping is direct:
To reach your third wallet, import the phrase and add accounts until three exist.
How to recover it
MetaMask, Rabby, Trust Wallet
Step-by-step for all three, including what to do when a wallet asks for the path directly
m/44'/60'/0'/0/{index} reproduces these addresses. That page
walks through the three whose interface needs explaining; anything else you already know how to
drive will work just as well.