ΔE 12.9, fair: the same colour family, but not a straight swap. Shadow Flesh is noticeably darker, warmer than Agate Skin.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Shadow Flesh is noticeably darker, warmer than Agate Skin.
The same difference applies the other way round: Agate Skin is noticeably lighter, 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 Agate Skin on the colour wheel See Shadow Flesh on the colour wheel
All matches: Agate Skin equivalents · Shadow Flesh equivalents