Onyx Skin vs Gnarlwood

How close are they?

ΔE 9.0, close: similar, with a visible difference side by side. Gnarlwood is a little lighter, warmer than Onyx Skin.

Can I use Gnarlwood instead of Onyx Skin?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Gnarlwood is a little lighter, warmer than Onyx Skin.

Can I use Onyx Skin instead of Gnarlwood?

The same difference applies the other way round: Onyx Skin is a little darker, cooler.

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.