yes, securing pgp keys on two yubikeys with equivalent copies is possible but involves careful key management to avoid gpg duplicates.

generate a new pgp keypair offline (master + sign/encrypt/auth subkeys) and back up private keys securely in an air-gapped setup.

for each yubikey: import the subkeys privately, run `gpg --edit-key yourkeyid` then `keytocard` for each subkey to move them to the card, export public key, and delete secret keys from your keyring (`gpg --delete-secret-keys`) before repeating for the second yubikey—keep the master private key offline.

yubico support

https://support.yubico.com/hc/en-us/articles/360013790259-using-your-yubikey-with-openpgp

security stackexchange

https://security.stackexchange.com/questions/181551/create-backup-yubikey-with-identical-pgp-keys