Does anyone know if they swap or not and if not what differences there are between them?

 

Don't know, and yes.

I believe they are direct bolt on but...

 

What info were you looking for? I've got a 370z rear subframe I'm building off of to go into my G35. Ballpark has the measurements close to going in, but I'm not to that point yet. Here's an article on the main differences. http://www.370z.com/MagazineArticles...uspension.aspx
The overall track is a little wider, rear wheel bearings are larger, as well as the outer axle splines are bigger.