Barbarian Flesh vs Elven Skin

How close are they?

ΔE 21.2, loose: different enough that you should pick on purpose. Elven Skin is a little darker, much more muted, warmer than Barbarian Flesh.

Can I use Elven Skin instead of Barbarian Flesh?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Elven Skin is a little darker, much more muted, warmer than Barbarian Flesh.

Can I use Barbarian Flesh instead of Elven Skin?

The same difference applies the other way round: Barbarian Flesh is a little lighter, 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.