Kroak Green vs Andalusian Earth

How close are they?

ΔE 47.0, loose: different enough that you should pick on purpose. Andalusian Earth is noticeably darker, much more muted, warmer than Kroak Green.

Can I use Andalusian Earth instead of Kroak Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 47). Andalusian Earth is noticeably darker, much more muted, warmer than Kroak Green.

Can I use Kroak Green instead of Andalusian Earth?

The same difference applies the other way round: Kroak Green is noticeably 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.