Stopped by a local Honda dealer today and talked to a service guy. He looked up some schematics and other things. It appears that the connectors and wiring are the same for each. The only difference is that PIN3 is the one for the steering wheel remote controller. The radio in question has no wire to that pin from the attached wiring harness.

Looks like it might work if that PIN exists on the head unit. At least that's what I'm hoping.