No if you cut the chamber for 9mm it is slightly larger & if the 38 is then fired in it the cases will fire form to the 9mm cylinder & stick..
I've heard of some doing it but of course there was that problem..
9mm in a snubbie is snappy but managable, In my Airweight it's a pretty good whack to the hand but not as fierce as a 357 magnum from a 13oz snub..
The standard 9mm rounds do seem to have slightly more recoil than a standard 38spl, more like a +P 38spl..
I did my convertion by fitting a 940-1 cylinder to my existing yolk/crane & can switch back to the 38spl cylinder by just removing the end shake screw & swap cylinders, I had to fit the new 940 cylinder to the existing hand & shim the new cylinder with two .002" end shake shims.
Hope this Helps!!
Enjoy All!!
Gary/Hk
9mm Model 642 No Dash aka M942