Raging Rouge vs Basic Flesh

How close are they?

ΔE 21.9, loose: different enough that you should pick on purpose. Basic Flesh is much more muted, warmer than Raging Rouge.

Can I use Basic Flesh instead of Raging Rouge?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Basic Flesh is much more muted, warmer than Raging Rouge.

Can I use Raging Rouge instead of Basic Flesh?

The same difference applies the other way round: Raging Rouge 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.