Barbarian Flesh vs Bogrin Brown

How close are they?

ΔE 30.7, loose: different enough that you should pick on purpose. Bogrin Brown is noticeably darker, warmer than Barbarian Flesh.

Can I use Bogrin Brown instead of Barbarian Flesh?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 31). Bogrin Brown is noticeably darker, warmer than Barbarian Flesh.

Can I use Barbarian Flesh instead of Bogrin Brown?

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