ΔE 15.1, loose: different enough that you should pick on purpose. Green Zinc Chrom. is noticeably lighter, more muted, cooler than Gangrene.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Green Zinc Chrom. is noticeably lighter, more muted, cooler than Gangrene.
The same difference applies the other way round: Gangrene is noticeably darker, 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 Gangrene on the colour wheel See Green Zinc Chrom. on the colour wheel
All matches: Gangrene equivalents · Green Zinc Chrom. equivalents