Within my humble experience, my 909/952 magazines were a bit longer than my blue and stainless 39/539/639 magazines. The 39/639 type magazines were not quite long enough to lock into my 952 and 952-1 pistols. Conversely, the 909/952 magazines stuck out, leaving a little gap between base plate and frame when inserted in the 39/639 guns.
FWIW, at a large gun show I once saw the later 909/952 type magazines in factory S&W packaging with a floor plate that closed the gap when using the longer magazines in the older 39/639 type pistols. There was mention of this on the packaging. Sure wish I'd bought a couple as I never saw this particular variation anywhere afterward......
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NRA Life, COTEP 640
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