Astorath Red vs Carnage Red

How close are they?

ΔE 9.2, close: similar, with a visible difference side by side. Carnage Red is a little darker, more saturated than Astorath Red.

Can I use Carnage Red instead of Astorath Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Carnage Red is a little darker, more saturated than Astorath Red.

Can I use Astorath Red instead of Carnage Red?

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