ΔE 26.0, loose: different enough that you should pick on purpose. Lemon Green is noticeably lighter, much more muted, warmer than Emerald Forest.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Lemon Green is noticeably lighter, much more muted, warmer than Emerald Forest.
The same difference applies the other way round: Emerald Forest is noticeably darker, 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.
See Emerald Forest on the colour wheel See Lemon Green on the colour wheel
All matches: Emerald Forest equivalents · Lemon Green equivalents