for sure their backpacks seems different from our canon... and they have ammo boxes hanging from the belt
... also what I can clearly recognize are long antennae, different hand-guards, different arm armor, no DIAMOND sniper plate, Stormtrooper AB plate, and ugly helmets. ... so, even if seems impossible to believe, for Disney is really difficult (or uneathly tough) to recreate the old ANH Sandtrooper armor appearence (WHY they have not made the armor and backpack EXACTLY as we seen in EP. IV????).
At the end they seems like normal Stormtroopers, with an added pauldron, a shoulder canvas pouch and a totally new backpack.