Clone means copy of original. Just pretend you have a name brand 1911, and pretend you have a real SIG, then order accordingly.
People have ordered Kimber 22LR slide/barrel conversion kits that fit right onto the Norinco 1911 frame. I have personally seen a real SIG slide on a Norinco P226 frame,both work perfectly.
This is why many people, myself included, order a Norinco 1911, then over time replace all the Norinco parts with fancy match grade parts so that you have a competition grade pistol in the end.