ΔE 14.9, fair: the same colour family, but not a straight swap. Russian AF Blue is a little darker, more saturated, cooler than RAF Azure Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Russian AF Blue is a little darker, more saturated, cooler than RAF Azure Blue.
The same difference applies the other way round: RAF Azure Blue is a little lighter, 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 RAF Azure Blue on the colour wheel See Russian AF Blue on the colour wheel
All matches: RAF Azure Blue equivalents · Russian AF Blue equivalents