ΔE 32.8, loose: different enough that you should pick on purpose. Poison Green is more saturated, cooler than Poisonous Cloud.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 33). Poison Green is more saturated, cooler than Poisonous Cloud.
The same difference applies the other way round: Poisonous Cloud is 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 Poisonous Cloud on the colour wheel See Poison Green on the colour wheel
All matches: Poisonous Cloud equivalents · Poison Green equivalents