Interesting. Last sets of XS carbs I had here for spring cleaning I was sure had the same diaphragms as all the BS40 sets I have done, but I didn't measure them to be sure they were exactly the same. The slides may be different diameters. I'd have to check my notes and dimensions.
I'm sure that with your attention to detail and meticulous work, that you would/did check those dimensions to be sure.
That Banshee ignition conversion is really nice.