ΔE 6.0, close: similar, with a visible difference side by side. Stonewall Grey is a little darker, more saturated than Light Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Stonewall Grey is a little darker, more saturated than Light Grey.
The same difference applies the other way round: Light Grey is a little lighter, more muted.
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 Grey on the colour wheel See Stonewall Grey on the colour wheel
All matches: Light Grey equivalents · Stonewall Grey equivalents