ΔE 13.3, fair: the same colour family, but not a straight swap. USN Light Ghost Grey is noticeably darker, more saturated than Misty Grey.
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 noticeably darker, more saturated than Misty Grey.
The same difference applies the other way round: Misty Grey is noticeably 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 Misty Grey on the colour wheel See USN Light Ghost Grey on the colour wheel
All matches: Misty Grey equivalents · USN Light Ghost Grey equivalents