header on the TRS and RS-3 is the same. Can design is where the changes are. TRS looks, sounds a bit different but the internal are essentially the same. TRS is supposed to provide better ground clearance.
I would bring a laptop with me to see if the PC is recognized by the Dynojet software. At least that's a start. Not an expert by any means.
I have a PCIII USB, TRS and small box mod and love the setup. Not too loud, looks nice, right price.