So let's clarify. The "original" M&P Compact (1.0) has a 3.6" barrel and takes a 12 round mag. The 2.0 Compact has either a 4" or 3.6" barrel and takes a 15 round mag. The 2.0 Subcompact is the same size as the 1.0 Compact and uses the same 12 round mags.
So the 2.0 Compact mags (15 rounds) will fit but will stick out a bit at the base. The 2.0 Subcompact mags will fit with no gap. You can even use the fullsize mags but they leave a large gap. XGrips makes spacers.
The 12 round mags come with either a flat (flush) base or with the pinky rest.
These are in stock.
Smith & Wesson M&P9C Compact 9mm 12-Round Factory Magazine with Finger Rest
Smith & Wesson M&P9 Sub-Compact 9mm 12 Round Extended Magazine | The Mag Shack