Necromancer Cloak vs N4 Neutral Gray

How close are they?

ΔE 9.3, close: similar, with a visible difference side by side. N4 Neutral Gray is more muted than Necromancer Cloak.

Can I use N4 Neutral Gray instead of Necromancer Cloak?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). N4 Neutral Gray is more muted than Necromancer Cloak.

Can I use Necromancer Cloak instead of N4 Neutral Gray?

The same difference applies the other way round: Necromancer Cloak is more saturated.

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.