ΔE 24.1, loose: different enough that you should pick on purpose. Russian AF Blue is noticeably lighter, much more saturated, cooler than Smoked Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Russian AF Blue is noticeably lighter, much more saturated, cooler than Smoked Blue.
The same difference applies the other way round: Smoked Blue is noticeably darker, much more muted, warmer.
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 Smoked Blue on the colour wheel See Russian AF Blue on the colour wheel
All matches: Smoked Blue equivalents · Russian AF Blue equivalents