ΔE 8.3, close: similar, with a visible difference side by side. Elf Skin Tone is more saturated, cooler than Desert Skin.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Elf Skin Tone 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 Elf Skin Tone on the colour wheel
All matches: Desert Skin equivalents · Elf Skin Tone equivalents