ΔE 36.6, loose: different enough that you should pick on purpose. Pecatum Flesh is noticeably lighter, much more saturated, warmer than Strong Skin Wash.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 37). Pecatum Flesh is noticeably lighter, much more saturated, warmer than Strong Skin Wash.
The same difference applies the other way round: Strong Skin Wash is noticeably darker, much 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 Strong Skin Wash on the colour wheel See Pecatum Flesh on the colour wheel
All matches: Strong Skin Wash equivalents · Pecatum Flesh equivalents