I have been purchasing a lot of the Kizlyar knives to add into my collecting hobby, and have been researching their methods of manufacturing. Their Phoenix knives are not differentially heat treated, (where the edge hardness is different than it's spine). The Tops version, (the Wild Pig Hunter), is indeed an edge differentially heat treated blade. The Tops also has a thicker blade, and maybe that may make the knife tougher overall than it's Kizlyar counterpart. But, there's a person that did a you-tube video showing some hard testing of his Kizlyar Phoenix Combat knife, and it proved it's salt. In any case, although the Tops and Kizlyar knives in this pattern are almost identical in their side blade profiles, the Tops has incorporated quite a few differences that does make it something more of their own, rather than just an exact knock-off of the original.