ΔE 6.9, close: similar, with a visible difference side by side. Emerald is a little darker than Light Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Emerald is a little darker than Light Green.
The same difference applies the other way round: Light Green is a little lighter.
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 Light Green on the colour wheel See Emerald on the colour wheel
All matches: Light Green equivalents · Emerald equivalents