The communication standard is the same, but until Tesla authorizes Hyundai public keys on superchargers, you won’t be able to initialize a session.

The native ccs plug means you can use current CCS stations at 800v 240kw charging without an adapter, while when NACS connectors roll out you will have to use an adapter to pull 240kw at existing CCS stations while you will be able to pull only ~150kw @400v from Tesla superchargers until they eventually roll out v4 superchargers in the US. I for one would rather use an adapter for the lower power Tesla connection than having to use one on high power CCS stations, so I’m happy I have a CCS car.