ΔE 13.4, fair: the same colour family, but not a straight swap. Russ. AF Grey Blue is a little lighter, more muted than Freezing Moon.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Russ. AF Grey Blue is a little lighter, more muted than Freezing Moon.
The same difference applies the other way round: Freezing Moon is a little darker, more saturated.
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 Freezing Moon on the colour wheel See Russ. AF Grey Blue on the colour wheel
All matches: Freezing Moon equivalents · Russ. AF Grey Blue equivalents