Verdigris vs Green Oxide

How close are they?

ΔE 22.3, loose: different enough that you should pick on purpose. Green Oxide is noticeably darker, more muted, cooler than Verdigris.

Can I use Green Oxide instead of Verdigris?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Green Oxide is noticeably darker, more muted, cooler than Verdigris.

Can I use Verdigris instead of Green Oxide?

The same difference applies the other way round: Verdigris is noticeably lighter, 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.