ΔE 6.7, close: similar, with a visible difference side by side. US Light Green is a little lighter, warmer than Modern Spanish Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). US Light Green is a little lighter, warmer than Modern Spanish Green.
The same difference applies the other way round: Modern Spanish Green is a little darker, cooler.
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 Modern Spanish Green on the colour wheel See US Light Green on the colour wheel
All matches: Modern Spanish Green equivalents · US Light Green equivalents