ΔE 12.2, fair: the same colour family, but not a straight swap. Skin Tone is noticeably lighter, cooler than Fair Shadow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Skin Tone is noticeably lighter, cooler than Fair Shadow.
The same difference applies the other way round: Fair Shadow is noticeably darker, 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 Fair Shadow on the colour wheel See Skin Tone on the colour wheel
All matches: Fair Shadow equivalents · Skin Tone equivalents