ΔE 11.5, fair: the same colour family, but not a straight swap. Light Sea Blue is a little darker, warmer than Light Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Light Sea Blue is a little darker, warmer than Light Blue.
The same difference applies the other way round: Light Blue is a little lighter, cooler.
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 Light Blue on the colour wheel See Light Sea Blue on the colour wheel
All matches: Light Blue equivalents · Light Sea Blue equivalents