Those are just generic oems available on fleabay or aliexpress for $1.
Maybe, maybe not. Try some of the $1 product and let us know their reliability and their ability to charge high-current devices.
The chargers I bought from Adafruit two years ago are still going strong, and still quickly charge everything I've thrown at them.
(I also buy them from Adafruit because I believe in their mission and I have huge respect for their founder Limor Fried.)