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I believe the case deflector is different.
Correct. They fit, but the face is cut slightly different on the .40. That said, newer 9mm kits I have seen have the same deflector as the .40 but I have yet to see a .40 with the original 9mm style deflector.

My guess is that there was a need to alter the face for the .40 and instead of making two different deflectors, they just started using the .40 deflectors on the 9mm.

When I do .40 builds, I will machine the face of the LSC deflector to match that of the factory .40.
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