Is it possible to put a D802 motherboard into a D800 G2 and still function?

Is it possible to put a D802 motherboard into a D800 G2 and still function? Or is that not possible?
Also, it it possible to transfer storage from one device to another, e.g swap a 32 gb storage with a 16 gb storage.

Just thinking upon these things, can't really find any information about it on Google.
Thanks