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More address belong to one wallet in Copay. I have a 12-word mnemonic to my old Copay wallet, but not the private key. If I would infer the private key of the 12-word could I reach all the public adresses with that private-key and start withdrawal?
Each private key corresponds to one public key, but a mnemonic key contains the master private key which describes how each private key is generated.
If you want to withdraw from it, I would use Electrum. It can show you the addresses and you can export individual private keys.
I don't know about your other question, but the public key and private key always work in a pair. So one public key and one private key have to work together. It is a one to one relationship.
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