ΔE 14.4, fair: the same colour family, but not a straight swap. Dark Sand is much more muted, cooler than Desert Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Dark Sand is much more muted, cooler than Desert Brown.
The same difference applies the other way round: Desert Brown is much more saturated, 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 Desert Brown on the colour wheel See Dark Sand on the colour wheel
All matches: Desert Brown equivalents · Dark Sand equivalents