ΔE 14.9, fair: the same colour family, but not a straight swap. Desert Tan is a little darker, much more saturated, cooler than Olive Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Desert Tan is a little darker, much more saturated, cooler than Olive Flesh.
The same difference applies the other way round: Olive Flesh is a little lighter, much more muted, 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 Olive Flesh on the colour wheel See Desert Tan on the colour wheel
All matches: Olive Flesh equivalents · Desert Tan equivalents