Grimy Grey vs Screaming Skull

How close are they?

ΔE 7.8, close: similar, with a visible difference side by side. Screaming Skull is a little lighter, more muted, cooler than Grimy Grey.

Can I use Screaming Skull instead of Grimy Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Screaming Skull is a little lighter, more muted, cooler than Grimy Grey.

Can I use Grimy Grey instead of Screaming Skull?

The same difference applies the other way round: Grimy Grey is a little darker, 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.