Difference between the 2016/17 and the 2018/2019 Atomic Backlands

Aside from the color scheme, what are the main differences in Atomic Backlands from 16/17 (the orange cuff with the blue boot) vs the 18/19 version?

I know the liner is new but I can’t seem to find info on what all the differences are in the old model and the new one structurally.