ΔE 20.3, loose: different enough that you should pick on purpose. Poison Green is noticeably darker, more muted, warmer than Death Guard Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Poison Green is noticeably darker, more muted, warmer than Death Guard Green.
The same difference applies the other way round: Death Guard Green is noticeably lighter, more saturated, 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 Death Guard Green on the colour wheel See Poison Green on the colour wheel
All matches: Death Guard Green equivalents · Poison Green equivalents