Dirty Red vs Carmine Red

How close are they?

ΔE 8.4, close: similar, with a visible difference side by side. Carmine Red is a little lighter than Dirty Red.

Can I use Carmine Red instead of Dirty Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Carmine Red is a little lighter than Dirty Red.

Can I use Dirty Red instead of Carmine Red?

The same difference applies the other way round: Dirty Red is a little darker.

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.