Welcome to the Let's Encrypt Community 
Yep. If the unneeded certificates' private keys haven't been compromised, just delete the unneeded certificates and their private keys.
Use this to find an unneeded certificate's Certificate_Name:
sudo certbot certificates
Use this command to safely delete an unneeded certificate and its private key:
sudo certbot delete --cert-name Certificate_Name
That will prevent the unnecessary renewal of any unneeded certificates.