ΔE 9.6, close: similar, with a visible difference side by side. Russian AF Blue is a little lighter than Duck Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Russian AF Blue is a little lighter than Duck Blue.
The same difference applies the other way round: Duck Blue is a little darker.
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 Duck Blue on the colour wheel See Russian AF Blue on the colour wheel
All matches: Duck Blue equivalents · Russian AF Blue equivalents