ΔE 12.8, fair: the same colour family, but not a straight swap. Russian AF Grey N.4 is a little darker, more muted, warmer than Faded Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Russian AF Grey N.4 is a little darker, more muted, warmer than Faded Green.
The same difference applies the other way round: Faded Green is a little lighter, more saturated, cooler.
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 Faded Green on the colour wheel See Russian AF Grey N.4 on the colour wheel
All matches: Faded Green equivalents · Russian AF Grey N.4 equivalents