That is very different. The KD price is a bit high - you are paying a lot for HA3. I'm sure someone mentioned these a week or so ago somewhere I was browsing - I think it was on one of the ratings for budget light dealers and it was less than half that price (but not HA3). Might have been manafont - not sure.
Why not just call it a 505B? They don't even tell you what kind of LED it has, though it looks like it comes with something. I like that it claims HA3, but I don't believe it. And there's nothing to stop it from rolling. I don't know about that one, but definitely let us know what you think of it when you get it.
You are right. I searched here and even at CPF about that "facelifted" version of 504B, but only find topics about the old model. Obviously I didn't searched hard enough :)
I guess we don't know if the threads on the "505b" are the same as the old 504b. I think that the threads compatibilty with Solarforce was the greatest appeal of the old 504b.
Temptation, temptation... :) I ordered Ultrafire ZF-7371 from them. The price is $29.16 + $7.38 shipping to Croatia. Not bad, average price on eBay is over $40.