ΔE 9.2, close: similar, with a visible difference side by side. Purple Hex is more saturated, warmer than Nocturne Skin.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Purple Hex is more saturated, warmer than Nocturne Skin.
The same difference applies the other way round: Nocturne Skin is more muted, 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 Nocturne Skin on the colour wheel See Purple Hex on the colour wheel
All matches: Nocturne Skin equivalents · Purple Hex equivalents