Aopen DUW 1608

I’m kinda interested in the Aopen DUW 1608 dvd burner. So i searched for the best prize around here (in Germany) and found different names of the drive. And that’s my question. What is the difference between 1608 Chameleon, 1608A und just 1608, if there is any?Or are they all the same as the DUW1608/ARR which you tested?
thx, aka

The part number all refer to the same box, no differences. The exact P/N for Aopen 16X DVDRW writer is :DUW1608ARR