ΔE 17.4, loose: different enough that you should pick on purpose. Forest Green is much more saturated, cooler than Toad Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Forest Green is much more saturated, cooler than Toad Green.
The same difference applies the other way round: Toad Green is much 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 Toad Green on the colour wheel See Forest Green on the colour wheel
All matches: Toad Green equivalents · Forest Green equivalents