Cobalt Teal vs Jade Green

How close are they?

ΔE 19.1, loose: different enough that you should pick on purpose. Jade Green is noticeably darker, more saturated, warmer than Cobalt Teal.

Can I use Jade Green instead of Cobalt Teal?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Jade Green is noticeably darker, more saturated, warmer than Cobalt Teal.

Can I use Cobalt Teal instead of Jade Green?

The same difference applies the other way round: Cobalt Teal 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.