ΔE 8.3, close: similar, with a visible difference side by side. Russian AF Grey N.3 is a little darker than N6 Neutral Gray.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Russian AF Grey N.3 is a little darker than N6 Neutral Gray.
The same difference applies the other way round: N6 Neutral Gray is a little lighter.
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 N6 Neutral Gray on the colour wheel See Russian AF Grey N.3 on the colour wheel
All matches: N6 Neutral Gray equivalents · Russian AF Grey N.3 equivalents