King Purple vs Necromancer Cloak

How close are they?

ΔE 8.8, close: similar, with a visible difference side by side. Necromancer Cloak is more muted, cooler than King Purple.

Can I use Necromancer Cloak instead of King Purple?

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

Can I use King Purple instead of Necromancer Cloak?

The same difference applies the other way round: King Purple is more saturated, 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.