I remember Size15's saying that they are regulated differently, one and two cell configurations, so they're not swapable.
I have never said that. The new product is the KX1 bezel which replaces the KL1. This has always been the case.
Note: I recognise that on some images of the E2L it is shown with a "KX2" bezel which looks the same as the "KX1" used by the E1L.
Whether these are different labels for the same bezel, or whether they are different bezels and there are interchangeability issues I don't know.
I don't have all the answers - I no longer have the time to be that deeply involved. My gut tells me they are simply etched to match the body (but then I am hungry so I could be very wrong)