Reddish Black vs Evil Red

How close are they?

ΔE 7.8, close: similar, with a visible difference side by side. Evil Red is a little darker, cooler than Reddish Black.

Can I use Evil Red instead of Reddish Black?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Evil Red is a little darker, cooler than Reddish Black.

Can I use Reddish Black instead of Evil Red?

The same difference applies the other way round: Reddish Black is a little lighter, 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.