ΔE 13.7, fair: the same colour family, but not a straight swap. Poison Ivy is noticeably darker, cooler than Potion Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Poison Ivy is noticeably darker, cooler than Potion Green.
The same difference applies the other way round: Potion Green is noticeably lighter, 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 Potion Green on the colour wheel See Poison Ivy on the colour wheel
All matches: Potion Green equivalents · Poison Ivy equivalents