ΔE 10.3, fair: the same colour family, but not a straight swap. USN Light Ghost Grey is more muted than Grey Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). USN Light Ghost Grey is more muted than Grey Blue.
The same difference applies the other way round: Grey Blue is 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 Grey Blue on the colour wheel See USN Light Ghost Grey on the colour wheel
All matches: Grey Blue equivalents · USN Light Ghost Grey equivalents