ΔE 9.0, close: similar, with a visible difference side by side. Russian AF Grey N.7 is more saturated than Gravestone Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Russian AF Grey N.7 is more saturated than Gravestone Blue.
The same difference applies the other way round: Gravestone Blue is more muted.
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 Gravestone Blue on the colour wheel See Russian AF Grey N.7 on the colour wheel
All matches: Gravestone Blue equivalents · Russian AF Grey N.7 equivalents