Excuse me
Import 2 different private key on the same wallet is not possible?
yes you can do that
Are you sure? Can Dan shed some light on this too just in case
I've done this numerous times. Running importprivkey on the target wallet can be done for as many keys as you like guaranteed. Every time you create a new address in the GUI it does pretty much that.
+1
Private keys are linked to addresses, not wallets. You can import as many as you want or need.
Also, conversely, your wallet balance may be spread over many addresses/private keys, and this can happen through the natural use of your wallet. That's why you need to keep regular backups of your wallet, not just your private keys.