Here we go with the two OEM Nissan figure:
350Z
370Z
From the images and parts numbers, we can see that 370Z diff comes with 4 satellites..... 350Z with only 2 satellites...
The other components seem to be more or less the same...
Any of you can give a reliable tech opinion? 
It would be of great interest for many of us here..... because there are a lot of ring-pinion couples for 350Z and would be important to be sure that they fit our 370Z.... 
Bye,