You cannot go by the exhibit armor color for the ESB armor, as both the exhibits feature Jedi-style armor. You can only guess they used a similar process on the ESB armor, which isn't even that safe of a guess.
I'm of the opinion that the chest armor for the ESB is a different color than the helmet. Thought it's probably heavily weathered, you just never see the armor do a freaky pepto like the helmet does at times.