ΔE 15.0, loose: different enough that you should pick on purpose. Basic Skin Tone is noticeably darker, more saturated than Ruby Skin.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Basic Skin Tone is noticeably darker, more saturated than Ruby Skin.
The same difference applies the other way round: Ruby Skin is noticeably lighter, more muted.
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 Skin Tone on the colour wheel
All matches: Ruby Skin equivalents · Basic Skin Tone equivalents