Traitor Red vs Carthalos Skin

How close are they?

ΔE 6.5, close: similar, with a visible difference side by side. Carthalos Skin is a little darker than Traitor Red.

Can I use Carthalos Skin instead of Traitor Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Carthalos Skin is a little darker than Traitor Red.

Can I use Traitor Red instead of Carthalos Skin?

The same difference applies the other way round: Traitor Red is a little lighter.

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.