ΔE 8.5, close: similar, with a visible difference side by side. Barren Dune is cooler than Washable Sand.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Barren Dune is cooler than Washable Sand.
The same difference applies the other way round: Washable Sand 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 Sand on the colour wheel See Barren Dune on the colour wheel
All matches: Washable Sand equivalents · Barren Dune equivalents