ΔE 25.9, loose: different enough that you should pick on purpose. Pickle Green is noticeably darker, much more muted, cooler than Warpstone Glow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Pickle Green is noticeably darker, much more muted, cooler than Warpstone Glow.
The same difference applies the other way round: Warpstone Glow 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 Warpstone Glow on the colour wheel See Pickle Green on the colour wheel
All matches: Warpstone Glow equivalents · Pickle Green equivalents