ΔE 10.6, fair: the same colour family, but not a straight swap. Skin Tone is a little lighter, warmer than Washable Sand.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Skin Tone is a little lighter, warmer than Washable Sand.
The same difference applies the other way round: Washable Sand is a little darker, cooler.
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 Washable Sand on the colour wheel See Skin Tone on the colour wheel
All matches: Washable Sand equivalents · Skin Tone equivalents