ΔE 22.2, loose: different enough that you should pick on purpose. Raw Sienna is a little lighter, much more saturated, cooler than Desert Skin.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Raw Sienna is a little lighter, much more saturated, cooler than Desert Skin.
The same difference applies the other way round: Desert Skin is a little darker, 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 Desert Skin on the colour wheel See Raw Sienna on the colour wheel
All matches: Desert Skin equivalents · Raw Sienna equivalents