ΔE 12.2, fair: the same colour family, but not a straight swap. USN Sea Blue is a little darker than Fade to Black.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). USN Sea Blue is a little darker than Fade to Black.
The same difference applies the other way round: Fade to Black is a little lighter.
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 Fade to Black on the colour wheel See USN Sea Blue on the colour wheel
All matches: Fade to Black equivalents · USN Sea Blue equivalents