Night Lords Blue vs Prussian Blue

How close are they?

ΔE 7.6, close: similar, with a visible difference side by side. Prussian Blue is cooler than Night Lords Blue.

Can I use Prussian Blue instead of Night Lords Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Prussian Blue is cooler than Night Lords Blue.

Can I use Night Lords Blue instead of Prussian Blue?

The same difference applies the other way round: Night Lords Blue is 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.