LOL ... the joys of posting in my 25min lunch break whilst trying to eat
White is higher friction than red ....
In 4wd I run red to the front, white to the rear with unpinned slipper (never been able to get on with the pinned slipper or the same pads Fr/Rr with a diff in the front personally ... I need a bit more give in the front when braking to suit my style).
Of course if you run the slipper pinned it doesn't really matter if the pads are mis-matched as there is no relative movement possible.
In the 2wd car I always run them paired up, white/white 98% of the time and only go red/red when I REALLY need to have the car slipping a long time after each corner.