differences in brake setups

[samfenna]

between rs models and non rs mk2
specifically the brake bias on the rear, are these different? i know master cylinder, servo etc needs to be changed, but what about the bias valve fitted near the rear beam? are these the same?

 

[Fred@BTM]

they don't have one, its inside the ABS pump

 

[samfenna]

so not even that load sesing bias?
cheers