ΔE 16.4, loose: different enough that you should pick on purpose. Russian AF Grey N.7 is a little darker, much more saturated than Cool Grey.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Russian AF Grey N.7 is a little darker, much more saturated than Cool Grey.
The same difference applies the other way round: Cool Grey is a little lighter, much more muted.
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 Cool Grey on the colour wheel See Russian AF Grey N.7 on the colour wheel
All matches: Cool Grey equivalents · Russian AF Grey N.7 equivalents