Moonstone Skin vs Orcish Dermis

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. Orcish Dermis is a little lighter, more saturated than Moonstone Skin.

Can I use Orcish Dermis instead of Moonstone Skin?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Orcish Dermis is a little lighter, more saturated than Moonstone Skin.

Can I use Moonstone Skin instead of Orcish Dermis?

The same difference applies the other way round: Moonstone Skin is a little darker, more muted.

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.