ΔE 26.0, loose: different enough that you should pick on purpose. Sick Green is noticeably darker, much more muted, cooler than Wurm Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Sick Green is noticeably darker, much more muted, cooler than Wurm Green.
The same difference applies the other way round: Wurm Green is noticeably lighter, much more saturated, 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 Wurm Green on the colour wheel See Sick Green on the colour wheel
All matches: Wurm Green equivalents · Sick Green equivalents