I have found one counterexample of that. The blue in my Sleipnir is definitely a different shade than my Overdrive. The Sleipnir is a bit brighter than the Overdrive's royal blue shade. Also, now that I think about it, my old e=mc2 was a bit more pastel than my Acrophobia's rosy shade of pink. But you're right about the gold's perfect consistency. Definitely a good look.