Looking at a photo of the new style mags, it looks like the new cutouts for the new reversible P-10 mag catch is of a different size and shape, in addition to being in a different location, on each magazine. Seems unlikely to me that the old P-10 mag catch could be installed in a new pistol's frame, and that it would work.
On a related note, I ordered two new P-07 mags from gregcotellc a couple of weeks ago, and they arrived without the new cutouts, but someone posted a picture of their new P-07 in the box around the same timeframe, and their new mags had the new cutouts.