Grass Green vs Emerald

How close are they?

ΔE 6.6, close: similar, with a visible difference side by side. Emerald is a little darker, more muted than Grass Green.

Can I use Emerald instead of Grass Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Emerald is a little darker, more muted than Grass Green.

Can I use Grass Green instead of Emerald?

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

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.