Flesh Wash vs Sepia Wash

How close are they?

ΔE 23.0, loose: different enough that you should pick on purpose. Sepia Wash is much more muted, cooler than Flesh Wash.

Can I use Sepia Wash instead of Flesh Wash?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Sepia Wash is much more muted, cooler than Flesh Wash.

Can I use Flesh Wash instead of Sepia Wash?

The same difference applies the other way round: Flesh Wash is much more saturated, warmer.

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.