Sorry mate I am still asleep - got home late from work last night! just reread your post
The suspension is the same for all of them (the JDMs) regardless of spec level. yes some have 17 and others 18inch wheels , and as far as UK and Jap differences - think the early JDM's have different shocks (more bouncy than my UK one anyway, we have found) Alex will know (Zmanalex)