Hull Red vs Nocturnal Red

How close are they?

ΔE 8.9, close: similar, with a visible difference side by side. Nocturnal Red is a little darker, more saturated than Hull Red.

Can I use Nocturnal Red instead of Hull Red?

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

Can I use Hull Red instead of Nocturnal Red?

The same difference applies the other way round: Hull 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.