ΔE 9.3, close: similar, with a visible difference side by side. Grey Spell is warmer than Space Wolves Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Grey Spell is warmer than Space Wolves Grey.
The same difference applies the other way round: Space Wolves 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 Space Wolves Grey on the colour wheel See Grey Spell on the colour wheel
All matches: Space Wolves Grey equivalents · Grey Spell equivalents