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