Blackened Brown vs Nocturnal Red

How close are they?

ΔE 9.8, close: similar, with a visible difference side by side. Nocturnal Red is a little lighter, more saturated, cooler than Blackened Brown.

Can I use Nocturnal Red instead of Blackened Brown?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Nocturnal Red is a little lighter, more saturated, cooler than Blackened Brown.

Can I use Blackened Brown instead of Nocturnal Red?

The same difference applies the other way round: Blackened Brown is a little darker, more muted, 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.