I just received a Para P16-40 with a supposed 10 round magazine. I also purchased separately some 16 round magazines. They appear to be identical. The "10" round will hold 15 rounds of 40.

What's even stranger, the 40 mags fit my P14-45 and my .45 mags fit my P16-40.

Are these mags identical or has there been a possible mixup?