Hi all I've been looking into rear lower wishbones and have been told they are specific to Allroad/A6/RS6 they all use variations of the same design and have different part numbers

Allroad 4B0 505 311/2
Rs6 4B3 505 311/2 A

It would be really helpful if anyone could tell me why or how they differ, I'm hoping it is that the Allroad one is straighter than the RS6 one so it lowers the hub height therefor ground clearance.

If the RS6 one lowers the shock by having more of a kick effectively raising the hub centre this is what I'm after.