What do you mean by "connect"?

Alby Hub has a lot of versatility. You can give each Nostr account a different sub-wallet, if you want each of them to have separate balances. If you want them to both have access to your full balance in Alby Hub, then you can go to Connections > Add Connection and set up a new connection with access to the full balance. You can give it a separate budget, etc, and copy/paste the connection string into the Nostr app while logged into the account you want to have access to it.

Receiving is even easier. Just put the same lightning address in the profile for each Nostr account you want to have received to your Alby Hub. Assuming that your king21@getalby.com already does so, you would just use that one. If you want to have different lightning addresses for each Nostr account then you will need to create separate Alby accounts for each lightning address you want to have. Sadly, though, you now need to pay them an annual subscription for each Alby account you want to have a custom address for. Outside of doing that, you just have to use whatever random address they assign to each account.