IMHO we're looking at two different troopers. There's a clear difference between the R1 TK and TD, both of which were equipped with backpacks, well at least some of the TKs were. The TK armor is generally not dirty (weathered), though his backpack is. The TD seen above in the magazine clearly has weathered armor. The backpacks are also different, well, at least the antennas are. Unfortunately without screen shots, behind the scene images, first hand knowledge provided by either the writers, Lucas or Disney, neither troopers received enough screen time to clearly differentiate their rolls.
If we indeed have a new version TD then someone should get a thread going so we can start the detail processing, similar to a CRL or SWAT spec update.