ΔE 25.7, loose: different enough that you should pick on purpose. Skarsnik Green is noticeably lighter, much more saturated, warmer than Poison Ivy.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Skarsnik Green is noticeably lighter, much more saturated, warmer than Poison Ivy.
The same difference applies the other way round: Poison Ivy is noticeably darker, much more muted, cooler.
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 Poison Ivy on the colour wheel See Skarsnik Green on the colour wheel
All matches: Poison Ivy equivalents · Skarsnik Green equivalents