Verdigris vs Faded Green

How close are they?

ΔE 21.4, loose: different enough that you should pick on purpose. Faded Green is much more muted, warmer than Verdigris.

Can I use Faded Green instead of Verdigris?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Faded Green is much more muted, warmer than Verdigris.

Can I use Verdigris instead of Faded Green?

The same difference applies the other way round: Verdigris is much 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.