ΔE 9.2, close: similar, with a visible difference side by side. Light Emerald is a little darker, warmer than Spectral Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Light Emerald is a little darker, warmer than Spectral Blue.
The same difference applies the other way round: Spectral Blue is a little lighter, 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 Spectral Blue on the colour wheel See Light Emerald on the colour wheel
All matches: Spectral Blue equivalents · Light Emerald equivalents