Buckskin Pale vs Flat Flesh

How close are they?

ΔE 17.8, loose: different enough that you should pick on purpose. Flat Flesh is a little darker, more saturated, warmer than Buckskin Pale.

Can I use Flat Flesh instead of Buckskin Pale?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Flat Flesh is a little darker, more saturated, warmer than Buckskin Pale.

Can I use Buckskin Pale instead of Flat Flesh?

The same difference applies the other way round: Buckskin Pale is a little lighter, more muted, 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.