This is Champagne - you'll have to excuse the rubbish quality of the photos because they have been taken on my iphone in cruddy office lighting with the blinds closed to keep the heat of the Adelaide summer out. However, you can still see that they are different.
From left: Champagne in the NYX Trio Barely There/Champagne/Root Beer, Champagne Single Eyeshadow.
And this is Salmon - it's a bit harder to tell in this picture because it's crap, but there's definitely a pinker tint to the single eyeshadow shade.
From left: Salmon from NYX Trio Platinum Pink/Salmon/Jazzy Bronze, Salmon Single Eyeshadow
I am baffled about why NYX would do this. I think I'm going to write to them and ask.