Boone Tan vs Ungor Flesh

How close are they?

ΔE 15.3, loose: different enough that you should pick on purpose. Ungor Flesh is noticeably darker, cooler than Boone Tan.

Can I use Ungor Flesh instead of Boone Tan?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Ungor Flesh is noticeably darker, cooler than Boone Tan.

Can I use Boone Tan instead of Ungor Flesh?

The same difference applies the other way round: Boone Tan is noticeably lighter, 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.