ΔE 18.1, loose: different enough that you should pick on purpose. Foul Green is a little darker, more saturated, cooler than Light Jade Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Foul Green is a little darker, more saturated, cooler than Light Jade Green.
The same difference applies the other way round: Light Jade Green is a little lighter, 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.
See Light Jade Green on the colour wheel See Foul Green on the colour wheel
All matches: Light Jade Green equivalents · Foul Green equivalents