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nick_h.-
In principle, the same process, but carbon fibre isn't such a good abrasive as alumina. Rubber bonded alumina is a common construction for abrasive blocks, discs and wheels, e.g. https://www.cratex.com/
Soft compound pads are chosen for carbon rims because they're gripper, which partially compensates for how grippy carbon fibre isn't compared with aluminium.
gbj_tester
Not necessarily. Rim scouring is done by flakes of alumina embedded in the pads, not by the rubber itself. Soft pads hold the alumina abrasive particle better than hard pads.