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