yes the mags are interchangeable

Yes, absolutely 💯

Hi Rickey, yes sir, Sig P226 magazines are compatible with the Tisas PX-9 Duty Comp.
It can utilize both 18-round and 20-round magazines from the P226 series.
budsgunshop.com/product_info.php/products_id/54266/mec-gar+sig+p226+magazine+18rd+9mm+anti-friction ,
.
budsgunshop.com/product_info.php/products_id/123101/mec-gar+mgp22620dps+sig+sauer+9mm+luger+sig+sauer+p226+20rd+black+anti-friction+coating+extended ,
.
Stay safe & have a great day!

Yes, they are.

Good afternoon to you!! The SIG Sauer P226 magazine are compatible in the Tisas PX-9 duty pistol. Hope this helps. Have a good rest of your weekend.
🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸
budsgunshop.com/search.php/q/sig+p226+magazine

Hi Rickey and welcome. Yes Sir, I have 2 PX-9 Duty pistols and use these P226 magazines no issue; budsgunshop.com/product_info.php/products_id/54266/mec-gar+mgp22618+sig+p226+magazine+18rd+9mm+anti-friction --------------------------------------------------------- budsgunshop.com/product_info.php/products_id/123101/mec-gar+mgp22620dps+sig+sauer+9mm+luger+sig+sauer+p226+20rd+black+anti-friction+coating+extended ------------------ Cheers, stay safe and enjoy!

Yes it is.