For mentioned reasons, NO, do not swap rear with front brake discs.
You can't look into those material.
In my experience front and rear brakes wear out pretty equally, but since in most of the cases its a lot of work (not to say a PITA) to change and maintain a rear brake with all this dismantling of muffler, shocks and most of the time axle- carrier.
So its seems to most of workshops and clients easier and cost effectiv, to change rear brake pads only.
With known result, thinned and grooved disc.