There is another pertinent difference between the 7,65 Parabellum cartridge and the DWM 9x19 round (actually, a couple of pertinent differences).
With the too-short 9mm round, the bullets snag on the top edge of the chamber. The 7,65 bullet, being narrower, does not present its ogive to the top of the chamber, so does not get caught up even if the OAL is a fraction shorter.
The original 9x19mm design used a truncated-cone bullet. Although not specifically designed this way for proper feeding, it coincidentally successfully mimics the ogive properties of the 7,65mm round. Some modern Winchester 9mm ball ammunition has a gently truncated-cone bullet.
--Dwight
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