Blushing Flesh vs Worn Red

How close are they?

ΔE 25.8, loose: different enough that you should pick on purpose. Worn Red is a little lighter, cooler than Blushing Flesh.

Can I use Worn Red instead of Blushing Flesh?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Worn Red is a little lighter, cooler than Blushing Flesh.

Can I use Blushing Flesh instead of Worn Red?

The same difference applies the other way round: Blushing Flesh is a little darker, 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.