Emerald Forest vs Light Green

How close are they?

ΔE 7.1, close: similar, with a visible difference side by side. Light Green is a little lighter, more muted than Emerald Forest.

Can I use Light Green instead of Emerald Forest?

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

Can I use Emerald Forest instead of Light Green?

The same difference applies the other way round: Emerald Forest is a little darker, 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.