Yes, same frame, same magazine wells; simply swap out upper slide/barrel assy and use respective VP9/40 mags. I originally bought a VP9 and the next day, HK came out with the Long Slide Kit. Now I had a spare 9mm slide laying around. Then HK started selling VP Frame Assys (complete with all the grip panels and mag loader), so I picked up one of those for my poor unwanted VP9 slide assembly. Saw a complete VP40 Slide Assy for sale over on HKPro, so I snapped that up; just had to get some VP40 mags. The VP40 is a 'snappy' round on the VP full-size frame and I have to admit I need to get used to it. Now I see HK came out with 9mm Match OR Slide Assys; yeah, somehow I see myself getting one of those too...
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