ΔE 16.0, loose: different enough that you should pick on purpose. Light Green (Yellow Shade) is a little lighter, more saturated, cooler than Poisonous Cloud. They are different kinds of paint: Army Painter Poisonous Cloud is an opaque base/layer paint and Golden Light Green (Yellow Shade) is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Light Green (Yellow Shade) is a little lighter, more saturated, cooler than Poisonous Cloud. They are different kinds of paint.
The same difference applies the other way round: Poisonous Cloud is a little darker, 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 Light Green (Yellow Shade) on the colour wheel
All matches: Poisonous Cloud equivalents · Light Green (Yellow Shade) equivalents