This would mean that at least in one of the two scenes it is a deliberate choice to recolour the sleeves. All this makes the change only more baffling to me. They took the time and attention to make these two scenes match, but broke continuity in so many other scenes
Ya know, if they only did it in one instance and not the other, I could understand that maybe they wanted to make it seem like two different lizard-men. But changing both… there’s no reasoning. It’s really the most pointless change.