Permanent Maroon vs Nocturnal Red

How close are they?

ΔE 9.5, close: similar, with a visible difference side by side. Nocturnal Red is a little lighter, warmer than Permanent Maroon.

Can I use Nocturnal Red instead of Permanent Maroon?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Nocturnal Red is a little lighter, warmer than Permanent Maroon.

Can I use Permanent Maroon instead of Nocturnal Red?

The same difference applies the other way round: Permanent Maroon is a little darker, cooler.

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.