ΔE 28.9, loose: different enough that you should pick on purpose. Black is noticeably darker, much more muted than Nocturne Skin.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Black is noticeably darker, much more muted than Nocturne Skin.
The same difference applies the other way round: Nocturne Skin is noticeably lighter, much more saturated.
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 Nocturne Skin on the colour wheel See Black on the colour wheel
All matches: Nocturne Skin equivalents · Black equivalents