I know theres differences, but id like to know the specifics, and if they interchangable with connecting parts from other models.

Base/XR/Cossie rear beam
Base/XR/Cossie front subframe/wishbones etc
Base/XR/Cossie hubs
Base/XR/Cossie shocks/springs (is it only how stiff they are, do they bolt up to any model?)
Base/XR/Cossie rear diff (Apart from no slipper, what else? they all bolt up to all rear beams and props? They all as strong? Ratio differences?)
Base/XR/Cossie (Obv cossie ones far better, but they bolt up to all other models hubs etc or?)

Thankyou please