ΔE 12.1, fair: the same colour family, but not a straight swap. USN Light Ghost Grey is a little darker, more muted than Whale Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). USN Light Ghost Grey is a little darker, more muted than Whale Grey.
The same difference applies the other way round: Whale Grey is a little lighter, 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 Whale Grey on the colour wheel See USN Light Ghost Grey on the colour wheel
All matches: Whale Grey equivalents · USN Light Ghost Grey equivalents