You can delete the wallet from the LIQUID app via the menu Settings → Remove account. After confirming, the wallet data will be removed from the app and you can sync with ZERO.
Important note:
If you recently recovered your wallet using your Perfect Key backup and made a typo while entering it, the ZERO will generate a different wallet with different addresses and no balances. If this happens, wipe the wallet on your ZERO and carefully import your backup again.
If the wallet still isn’t the same on both devices after these steps, please contact support@ngrave.io.