ΔE 11.1, fair: the same colour family, but not a straight swap. Celestra Grey is a little lighter, more muted, cooler than Freezing Moon.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Celestra Grey is a little lighter, more muted, cooler than Freezing Moon.
The same difference applies the other way round: Freezing Moon is a little darker, more saturated, 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 Freezing Moon on the colour wheel See Celestra Grey on the colour wheel
All matches: Freezing Moon equivalents · Celestra Grey equivalents