ΔE 9.6, close: similar, with a visible difference side by side. Emerald is a little lighter, cooler than Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Emerald is a little lighter, cooler than Green.
The same difference applies the other way round: Green is a little darker, 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.
See Green on the colour wheel See Emerald on the colour wheel
All matches: Green equivalents · Emerald equivalents