ΔE 9.5, close: similar, with a visible difference side by side. Barren Dune is a little lighter, more saturated than Desert Sand.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Barren Dune is a little lighter, more saturated than Desert Sand.
The same difference applies the other way round: Desert Sand is a little darker, more muted.
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 Desert Sand on the colour wheel See Barren Dune on the colour wheel
All matches: Desert Sand equivalents · Barren Dune equivalents