Sand Grey vs Stonewall Grey

How close are they?

ΔE 13.8, fair: the same colour family, but not a straight swap. Stonewall Grey is a little darker, more muted than Sand Grey.

Can I use Stonewall Grey instead of Sand Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Stonewall Grey is a little darker, more muted than Sand Grey.

Can I use Sand Grey instead of Stonewall Grey?

The same difference applies the other way round: Sand Grey is a little lighter, 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.