Quite a few differences between the cars,although I like the idea of Dom's car having a built bottom end.
Tsukuba car has stock air box,not ARC,BBS mags,not Enkei,white bonnet with small vent ,not black with large vent.Black cannards and lip on Tsukuba car,not on Doms.Rear brakes are stock on Tsukuba car,4 pot Alcons on Doms.These are just the obvious ones.
I think the biggest difference might be that the Tsukuba car is based on an N1,while Doms car is based on a V Spec 2,though not entirely sure on that one