Welcome to the forums! I see you're new here. There is a great deal of information to be found in here, all you have to do is look around for a while and you'll soon see why these knives are probably not even fit to be doorstops. That being said, I'll try to point out a few things I noticed in the listings you provided.
One listing said "440" steel, the other just "stainless steel". Most, if not all of us here who are more than halfway serious about our knives are particular of what kind of steel far beyond just stainless, we want to know exactly what kind of steel (154, S30V, 1095, 52100, just to name a very few).
As markksr pointed out, the ad copy itself provides some clues. Where they say, "THIS (and the Smith & Wesson model) IS THE BEST WE'VE SEEN", they obviously haven't seen much.
The fact that one of the knives is called "Karambit Urban Titanium", when ther is no titanium in the knife whatsoever, just a "titanium camo finish" is misleading and laughable.
The only other one I want to point out is where they have their "history of the Karambit" . They point out that this knife was the "pocket knife of ancient villagers". Except in the 11th century A.D. they didn't have pockets. In fact, most native Indonesians didn't have clothing with pockets 100 years ago, let alone 1,000. Many didn't have much clothing, if any. I've seen enough pictures of my grandparents and great-grandparents to know that (I'm half Indonesian).
There are many more inconsistencies, half-truths, and just plain garbage in those ads, but I think that's enough to give you some answers.
Good luck in finding a quality knife. There plenty of people with far more experience than I'll ever have to help you, but make sure you have a good look around first. You'll find that most questions you want to ask have been asked before, and answered.