i disagree completely. just look at how they effect other morphs. lesser spiders look completely different from butter spiders. butters have a richer yellow and darker along the back.
also black pastel and cinny can be hard at times especially when crossed together. but usually black pastels are darker when younger and from what ive noticed the pattern seems to be a little more aberrant. cinnies tend to have a a lighter head and a more subtle pattern(when compared to black pastels).
adam jeffery