3M says the blue are a polishing pad, the 3M black would be a finishing pad.
I can finish down very easy with the 3M blue on a soft black lexus clear and ultrafina. On the same finish they will remove the wool effect that is left from edge yellow and Presta 1500 polish.
Going to yellow wool and 3M ECC, requires another step before the 3M blue and ultrafina.