Carthalos Skin vs Dark Rust

How close are they?

ΔE 8.1, close: similar, with a visible difference side by side. Dark Rust is a little lighter, cooler than Carthalos Skin.

Can I use Dark Rust instead of Carthalos Skin?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Dark Rust is a little lighter, cooler than Carthalos Skin.

Can I use Carthalos Skin instead of Dark Rust?

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