ΔE 35.6, loose: different enough that you should pick on purpose. Umber Wash is much more muted, warmer than Pecatum Flesh.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 36). Umber Wash is much more muted, warmer than Pecatum Flesh.
The same difference applies the other way round: Pecatum Flesh is much 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 Pecatum Flesh on the colour wheel See Umber Wash on the colour wheel
All matches: Pecatum Flesh equivalents · Umber Wash equivalents