I have the new yokomo bmax factory team and all the blue is pretty darn close, if not exact (and there is a lot of alloy on that thing!). Even the blue anodizing on my BJ4 W.E. is pretty much an exact match.

On the B44 I had, the front casters, servo mounts, and rear wing mount were a darker blue. The center diff/motor mounts and front shock tower brace were a lighter blue.

Anyway, I don't see the variance in other brands...so maybe Associated just has different vendors doing different parts.