Dusty Skull vs Bright Brown Grey

How close are they?

ΔE 7.9, close: similar, with a visible difference side by side. Bright Brown Grey is more muted, warmer than Dusty Skull.

Can I use Bright Brown Grey instead of Dusty Skull?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Bright Brown Grey is more muted, warmer than Dusty Skull.

Can I use Dusty Skull instead of Bright Brown Grey?

The same difference applies the other way round: Dusty Skull is more saturated, cooler.

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.