Well taking a stab, the only thing i could say is that as Salomon and Atomic are both owned by Amer Sports then they may have similarities in BSL on similar boots..
An older xwave 8 in 27/27.5 was 315mm, and I think they stayed that way with the impact series, so the Atomic Nuke series MIGHT be the same..
A very unreliable way to look at it though.