ΔE 8.3, close: similar, with a visible difference side by side. Russian AF Grey N.7 is a little lighter, more saturated than Blue Gray.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Russian AF Grey N.7 is a little lighter, more saturated than Blue Gray.
The same difference applies the other way round: Blue Gray is a little darker, 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 Blue Gray on the colour wheel See Russian AF Grey N.7 on the colour wheel
All matches: Blue Gray equivalents · Russian AF Grey N.7 equivalents