yeah the real killer is the floor pan as mentioned. gbox mounts differ as well, rear gtr diff also has provision for the attesa pumps on top. You also need the entire attesa controller/loom as well so the split control works which you won't have.
Its a fair bit of work. If you have a front cut then you would just drop the entire sub frame out and swap it in which will work. But as already mentioned the floor pan makes running a gtr box difficult, can be persuaded but lol.
I would do it personally, I love 4wd. Nothing quite like being 10 car lengths on them while there still back at the lights going sideways.