The rear calipers are definitely several full shades darker than stock, but not as baked olive green as the front calipers. That is mostly because I run with DTC off, but if you wanted them the same then leave it on and they will catch up and quickly surpass the fronts.
I didn't think that there would be any interest in them, but if there is PM me. They are boxed and just taking up space in my garage since I installed my StopTech Trophy Sport BBK.