i don't know if they're exactly the same, but they are (at the very least) compatible. might have different markings or something like that, but otherwise they are the same.
just like the KT4, and the bezel of the M4.
all of those fit the same lamps (MN15,MN16,MN20,MN21,MN60,MN61,N1,N2, and several lumens factory offerings). you just need to get the correct voltage to them, as most of them are designed for different voltages/battery configurations.
other bezels that will fit on the same threads, are the M3 bezel, and the KL6 (which is the L6 bezel). but the M3 bezel fits different bulbs (MN10,MN11, and some lumens factory offerings), and the KL6 is a LED head, so no bulb is needed.