Potion Green vs Green FS34227

How close are they?

ΔE 8.7, close: similar, with a visible difference side by side. Green FS34227 is a little darker, more saturated than Potion Green.

Can I use Green FS34227 instead of Potion Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Green FS34227 is a little darker, more saturated than Potion Green.

Can I use Potion Green instead of Green FS34227?

The same difference applies the other way round: Potion Green is a little lighter, 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.