ΔE 15.2, loose: different enough that you should pick on purpose. Sick Green is a little lighter, much more saturated than Plague Toad Venom.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Sick Green is a little lighter, much more saturated than Plague Toad Venom.
The same difference applies the other way round: Plague Toad Venom is a little darker, much more muted.
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 Plague Toad Venom on the colour wheel See Sick Green on the colour wheel
All matches: Plague Toad Venom equivalents · Sick Green equivalents