ΔE 6.4, close: similar, with a visible difference side by side. Plague Green is a little darker than Toad Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Plague Green is a little darker than Toad Green.
The same difference applies the other way round: Toad Green is a little lighter.
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 Plague Green on the colour wheel
All matches: Toad Green equivalents · Plague Green equivalents