Are gearboxes interchangeable?

Very much doubt it. Aside from the block bolt pattern and spline count to think of, the N15 clutch is cable, and N16 is hydraulic.

Why are you thinking of doing that?
 
Bellhousings are different.

There was a guy here in Australia that bought up all of nissans 70 series sr bellhousings and swapped them onto qg 70a boxes.

However they are now listed as NLA with Nissan.
 
Very much doubt it. Aside from the block bolt pattern and spline count to think of, the N15 clutch is cable, and N16 is hydraulic.

Why are you thinking of doing that?
I have a n15 with a dodgy gearbox but came across a cheap n16 gearbox i thought it may have fitted.
 
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