They are on the same plat form however the suspension is a little different between the 2
comparing the 2nd gen FX/QX70 to a 370Z
the front struts on the Z have a bushing at the bottom to bolt to the arm and the FX/QX bolt to the lower arm with a wishbone mount.
the arms themselves have different mounting points as well so you couldnt swap over the arm either
370Z front suspension

370Z FRONT
FX/QX front suspension

FX FRONT
in the rear the shock bolts to the top of the knuckle where on the FX/QX the shock bolts to one of the lower control arms a little ahead of the knuckle so my guess is the top mounts would not line up even if you were able to mount the rest of the arms
370Z rear suspension

370Z REAR

370Z REAR 2
FX/QX rear suspension

FX REAR

FX REAR 2
The first gen FX has the same rear set up and the front uses a McPherson strut
depending on the level of modification you wanted to get in to you maybe able to swap the front and rear subframe assemblies from a FX/QX on to a Z but I would imaging it would need modification and not be a straight forward bolt on job
this would be an enormous project and I have to imagine there is an easier way to get a few inches of height for what you are looking to do
I love the look of the jacked Z though I have not done much research on it as I do not have a Z myself but maybe some coilovers set at max height and the strut spacers might get you there
hope this info helps and I look forward to seeing your lifted Z