Tuscan brake upgrade?

[TUS 373]

Just wondering whether those of you with Red Rose or Tuscan S's can tell me - what/is there a difference in the rear callipers + discs compared to the standard Tuscan?

I know the front callipers and discs are slightly bigger on RR/S models. I also know that the front callipers on later standard Tuscans are heavier than on the earlier ones. I know nothing about rear callipers though!

Thanks
Bryan