The Magura "MT Thirty" 4 piston is an "MT2* (Sport)" Lever with a "MT5" caliper.
The Magura "MT Thirty" 2 piston is an "MT2* (Sport)" Lever and caliper.
Either unit flip/flops for front/rear fitment, so OEM's can be flexible spec'ing a bike with number of pistons front and rear. A maker might...