ΔE 11.3, fair: the same colour family, but not a straight swap. Celestra Grey is a little darker, more saturated than Glass Moon Light.
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 darker, more saturated than Glass Moon Light.
The same difference applies the other way round: Glass Moon Light is a little lighter, 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 Glass Moon Light on the colour wheel See Celestra Grey on the colour wheel
All matches: Glass Moon Light equivalents · Celestra Grey equivalents