You can use either one. The JDM or USDM P72, as long as they're OBD-2. If not, you're gonna have to get a jumper harness, and match the distributor to the OBD that your ECU will be.
I'm not sure if the Integra ECU's went from OBD-2a to OBD-2b, like the Civic's did, but you should check that before you buy an ECU.
Hope this helps.