Jade vs Light Turquoise

How close are they?

ΔE 17.8, loose: different enough that you should pick on purpose. Light Turquoise is noticeably lighter, more saturated, cooler than Jade.

Can I use Light Turquoise instead of Jade?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Light Turquoise is noticeably lighter, more saturated, cooler than Jade.

Can I use Jade instead of Light Turquoise?

The same difference applies the other way round: Jade is noticeably darker, more muted, 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.