Caliban Green vs Jade Green

How close are they?

ΔE 21.7, loose: different enough that you should pick on purpose. Jade Green is noticeably lighter, cooler than Caliban Green.

Can I use Jade Green instead of Caliban Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Jade Green is noticeably lighter, cooler than Caliban Green.

Can I use Caliban Green instead of Jade Green?

The same difference applies the other way round: Caliban Green is noticeably darker, 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.