ΔE 13.6, fair: the same colour family, but not a straight swap. Mahogany Brown is noticeably lighter, warmer than Nocturne Skin.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Mahogany Brown is noticeably lighter, warmer than Nocturne Skin.
The same difference applies the other way round: Nocturne Skin is noticeably darker, 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 Mahogany Brown on the colour wheel
All matches: Nocturne Skin equivalents · Mahogany Brown equivalents