ΔE 8.0, close: similar, with a visible difference side by side. Medium Grey Blue is a little darker, cooler than Light Gray.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Medium Grey Blue is a little darker, cooler than Light Gray.
The same difference applies the other way round: Light Gray is a little lighter, 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 Light Gray on the colour wheel See Medium Grey Blue on the colour wheel
All matches: Light Gray equivalents · Medium Grey Blue equivalents