Arid Earth vs Boone Tan

How close are they?

ΔE 25.2, loose: different enough that you should pick on purpose. Boone Tan is noticeably darker, more saturated, warmer than Arid Earth.

Can I use Boone Tan instead of Arid Earth?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Boone Tan is noticeably darker, more saturated, warmer than Arid Earth.

Can I use Arid Earth instead of Boone Tan?

The same difference applies the other way round: Arid Earth is noticeably 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.