Blush Red vs Flesh Wash

How close are they?

ΔE 39.1, loose: different enough that you should pick on purpose. Flesh Wash is a little darker, much more muted than Blush Red.

Can I use Flesh Wash instead of Blush Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 39). Flesh Wash is a little darker, much more muted than Blush Red.

Can I use Blush Red instead of Flesh Wash?

The same difference applies the other way round: Blush Red is a little lighter, much 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.