ΔE 13.2, fair: the same colour family, but not a straight swap. USN Light Ghost Grey is a little lighter than Rainy Gray.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). USN Light Ghost Grey is a little lighter than Rainy Gray.
The same difference applies the other way round: Rainy Gray is a little darker.
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 Rainy Gray on the colour wheel See USN Light Ghost Grey on the colour wheel
All matches: Rainy Gray equivalents · USN Light Ghost Grey equivalents