I have an upcoming trip where I will be flying into JFK on DL on one ticket, and then need to connect to a B6 flight on another ticket that same evening.

There are no lounges in T5, will I be able to use the Centurion lounge in T4 (assuming I am all carry-on and don't need to exit to get my luggage)? I would think yes, since I have a flight that evening, but it is from a different terminal.