Quartz Skin vs Moonray Flesh

How close are they?

ΔE 6.8, close: similar, with a visible difference side by side. Moonray Flesh is a little darker, cooler than Quartz Skin.

Can I use Moonray Flesh instead of Quartz Skin?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Moonray Flesh is a little darker, cooler than Quartz Skin.

Can I use Quartz Skin instead of Moonray Flesh?

The same difference applies the other way round: Quartz Skin is a little lighter, warmer.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.