Hey JO, nope, definately different. D swinger is about 15mm longer, bell crank has different ratio,struts mount in different position on D (further forward), different top out stop for the Z etc, suttle but better in every way for the D, the '84 (E?) is different again. I have a Z and a D 465/500 side by side in my cave at the moment, well z is in pieces but you get the idea!
For me i reckon the Z turned quicker but the D was better everwhere else, still didnt stop me getting hole shots on a 465Z against them though!
Oh, and similar differences on the 250s as well.
Kt