ΔE 9.6, close: similar, with a visible difference side by side. Brown Wash is a little lighter, more muted, warmer than Strong Skin Shade.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Brown Wash is a little lighter, more muted, warmer than Strong Skin Shade.
The same difference applies the other way round: Strong Skin Shade is a little darker, more saturated, 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 Strong Skin Shade on the colour wheel See Brown Wash on the colour wheel
All matches: Strong Skin Shade equivalents · Brown Wash equivalents