ΔE 6.1, close: similar, with a visible difference side by side. Lavender Grey is more muted than Stonewall Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Lavender Grey is more muted than Stonewall Grey.
The same difference applies the other way round: Stonewall Grey is more saturated.
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 Stonewall Grey on the colour wheel See Lavender Grey on the colour wheel
All matches: Stonewall Grey equivalents · Lavender Grey equivalents