ΔE 28.8, loose: different enough that you should pick on purpose. Foul Green is noticeably lighter, much more saturated than Green Oxide.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Foul Green is noticeably lighter, much more saturated than Green Oxide.
The same difference applies the other way round: Green Oxide is noticeably darker, much more muted.
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 Green Oxide on the colour wheel See Foul Green on the colour wheel
All matches: Green Oxide equivalents · Foul Green equivalents