They are the same as choke chains which unfortunately is a misnomer, since they aren't chains. But yes, they're similar in that they tighten when the dog pulls on the leash, same as a martingale does. They're just lighter and easier on the dog's neck IMO.
I just had a look at them and I see what you mean. I might have a look at them in a pet shop and seeif it would be right for simba.