ΔE 3.2, very close: most people won’t see a difference side by side. Dreadful Visage is warmer than Ruins Grey. They are different kinds of paint: AMMO by Mig Ruins Grey is an opaque base/layer paint and Citadel Dreadful Visage is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 3). Dreadful Visage is warmer than Ruins Grey. They are different kinds of paint.
The same difference applies the other way round: Ruins Grey is cooler.
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 Ruins Grey on the colour wheel See Dreadful Visage on the colour wheel
All matches: Ruins Grey equivalents · Dreadful Visage equivalents