Crusted Sore vs Muddy Clay

How close are they?

ΔE 9.1, close: similar, with a visible difference side by side. Muddy Clay is a little darker, cooler than Crusted Sore.

Can I use Muddy Clay instead of Crusted Sore?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Muddy Clay is a little darker, cooler than Crusted Sore.

Can I use Crusted Sore instead of Muddy Clay?

The same difference applies the other way round: Crusted Sore is a little lighter, 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.