There are two kinds of color matching: "Absolutely perfect" and "It might as well be lime green." "Not quite perfect but close enough" does not exist. A less-than-perfect color match will draw your eye to the touched up chip much more so than if it was left bare.

I own some bikes that have fade and shadeshifter paint jobs that simply can't be color matched. I treat the nicks with clear nail polish and have been quite satisfied with the result.