ΔE 12.1, fair: the same colour family, but not a straight swap. Ratskin Flesh is more saturated, cooler than Desert Skin.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Ratskin Flesh is more saturated, cooler than Desert Skin.
The same difference applies the other way round: Desert Skin is 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 Desert Skin on the colour wheel See Ratskin Flesh on the colour wheel
All matches: Desert Skin equivalents · Ratskin Flesh equivalents