They are the same but they aren't.
Today's factory loaded 9 mm has a shorter OAL than the original round as designed by Georg Luger and first loaded by DWM. The who, when, where, and whats of this change are at present unknown. (At least to me.) It's a mystery why, as I can think of no advantage to be gained by shortening the round, except perhaps a better neck grip on the bullet but I've never heard of any problems in that are with the original.
It's the real behind the scenes cause of the Luger's sometimes spotty reputation for reliability as the magazine design, like most 22 LR magazines, depends on a correct OAL for a proper feed angle. The 22 LR magazine s forced to this technique because it's a rimmed cartridge. The Luger uses this technique because of the slanted grip angle.
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