ΔE 12.7, fair: the same colour family, but not a straight swap. Petroleum Brown Wash is a little lighter, more saturated, warmer than Dark Skin Shade.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Petroleum Brown Wash is a little lighter, more saturated, warmer than Dark Skin Shade.
The same difference applies the other way round: Dark Skin Shade is a little darker, 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 Dark Skin Shade on the colour wheel See Petroleum Brown Wash on the colour wheel
All matches: Dark Skin Shade equivalents · Petroleum Brown Wash equivalents