You need not only the parts numbers for the parts on the respective vehicles, but the actual part number assigned to the part.
For instance, our front brake rotors are common to a Nissan Pathfinder, but if you look up the parts numbers in the respective vehicle manuals, they will not be the same.
I guess they key we weould look for is "dimensionally identical". For most parts this is sufficient.
AFAIK (Sorry, don't have the part numbers on me)
Rear differential: Sylvia, possibly Skyline. Not the same as 300ZX.
Air filter: 300Z (not 300ZX), Sylvia.
Front brake rotors: Nissan Pathfinder (per Bradi of Italy)
Center door lock switch: Previous version Maxima/Bluebird
HVAC: Infiniti I30?
ECU/TCU: Nissan for certain, don't know if any particular model
Transmission: Like duh
Front struts: 99% dimensionally identical to Impreza units, but different rates. Not shared with Pathfinder, Maxima/Bluebird, 240SX/Sylvia, Q45/President. I could not find a picture of Skyline shocks to do a comparo.
We know the rear wheel bearings are shared with something, we just don't know what.
You know the diagnostic port? Nissans have them too. Anything that plugs into the Nissan port (like a Tectom unit) should plug into ours as well. Apexi used to make a neato Nissan specific computer. Used to.