I tried matching celeste once... Bianchi Pista Pro saddle with celeste accents + Rubino Pro celeste sidewall tires + Cinelli celeste bar tape = every color different. The Bianchi saddle was the worst.. much too bright and not enough blue for even their newer bikes. The tires weren't bad, but the color changes with road conditions. The bar tape was a little too faded at first, but it eventually sort of matched the tires. I think Cinelli matched their color to older Bianchis, which don't have as much color saturation, and seem faded.

Just my experience.