ΔE 7.6, close: similar, with a visible difference side by side. Mid Mustard Khaki is cooler than Washable Dust.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Mid Mustard Khaki is cooler than Washable Dust.
The same difference applies the other way round: Washable Dust is 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.
See Washable Dust on the colour wheel See Mid Mustard Khaki on the colour wheel
All matches: Washable Dust equivalents · Mid Mustard Khaki equivalents