ΔE 10.4, fair: the same colour family, but not a straight swap. Dark Sea Blue is a little lighter, more saturated than Semi Gloss Black.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Dark Sea Blue is a little lighter, more saturated than Semi Gloss Black.
The same difference applies the other way round: Semi Gloss Black is a little darker, 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 Semi Gloss Black on the colour wheel See Dark Sea Blue on the colour wheel
All matches: Semi Gloss Black equivalents · Dark Sea Blue equivalents