No. The .46 is a larger diameter. That is why the .46 is a tad lighter than the .40, material has been removed to allow the larger cylinder liner. Remember, we are talking about displacement here, which involves both the stroke AND the bore. In order to get larger displacement, something has to get bigger. In the mater of the FX, the O.D. of the cylinder liner has to be the same, and bore smaller for the .40
Type at you later,
Dan McEntee