I just noticed that the second light is reviewed here by djozz. But its got a different pill/head design that is far better. That is the issue with some of these budget lights... Lack of consistency in parts. Im not worried about the emitter, its just not suitable for increasing the current to a level I would desire... :p There could be differences in headband and other things too. I would prefer the AA versions of these lights too..
The 3rd one is not the same light as the one you are linking too. But there are some similarities...
Im not even sure Ill bother assembling the "sipik headlamp". Im tempted to try and rebuild it into a triple XP-G2 with TIR at some point. If not, driver and emitter swap would be easy. Im certainly not putting it together with the stock emitter and driver..