ΔE 11.7, fair: the same colour family, but not a straight swap. Basic Flesh is noticeably darker, warmer than Ruby Skin.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Basic Flesh is noticeably darker, warmer than Ruby Skin.
The same difference applies the other way round: Ruby 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 Ruby Skin on the colour wheel See Basic Flesh on the colour wheel
All matches: Ruby Skin equivalents · Basic Flesh equivalents