Will Ledger recover the same Ethereum account I created the Meta Mask addresses with or will Ledger create a empty new one, since Ledger live can not see balances?
You will be able to recover your addresses, so long as you use the same seed phrases and derivation paths. Even if Ledger wallet ever ceased to exist. You can still recover the funds using another compatible wallet (Web wallet, hardware, or software) Just make sure you keep your seed phrase very safe and also have some idea about the derivation path Ledger wallet uses (I believe it uses the most common one)