Look says that its Kéo 2 Max pedal is aimed at the Granfondo rider, whereas it pitches its Kéo Blade at the racer. The blade design makes the pedal a bit lighter and more aero than the Kéo 2 Max, but also less adjustable.
Within the Kéo 2 Max family, there’s the standard model, with a composite body and the Kéo 2 Max Carbon, which has a carbon fibre body. There’s not much difference in weight between the two, with the Carbon version losing around 10g a pair.