ΔE 8.6, close: similar, with a visible difference side by side. Daemonette Hide is a little darker, cooler than Stonewall Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Daemonette Hide is a little darker, cooler than Stonewall Grey.
The same difference applies the other way round: Stonewall Grey 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 Stonewall Grey on the colour wheel See Daemonette Hide on the colour wheel
All matches: Stonewall Grey equivalents · Daemonette Hide equivalents