Muddy Wash vs Umber Wash

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. Umber Wash is more muted, warmer than Muddy Wash.

Can I use Umber Wash instead of Muddy Wash?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Umber Wash is more muted, warmer than Muddy Wash.

Can I use Muddy Wash instead of Umber Wash?

The same difference applies the other way round: Muddy Wash 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.