Warm Skin Shade vs Flesh Wash

How close are they?

ΔE 25.6, loose: different enough that you should pick on purpose. Flesh Wash is noticeably lighter, more muted than Warm Skin Shade.

Can I use Flesh Wash instead of Warm Skin Shade?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Flesh Wash is noticeably lighter, more muted than Warm Skin Shade.

Can I use Warm Skin Shade instead of Flesh Wash?

The same difference applies the other way round: Warm Skin Shade is noticeably darker, more saturated.

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.