Gino,
Under most circumstances, a "1920 Commercial" is found originally in .30 cal. Does the 9mm have a sear safety or markings which might indicate that it was rebarelled for an authentic purpose?
Also, the term Alphabet Commercial has superceded the "1920 Commercial" designation. This is because the serial number on the frame includes a small, script letter--this is properly (and legally) part of the serial number itself, and should always accompany it in any description.
Knowing the suffix on the pistols you are considering might affect a recommendation, particularly if the suffix of the 9mm is s, t, or u.
--Dwight
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