ΔE 6.3, close: similar, with a visible difference side by side. Light Sea Blue is more muted than Manganese Blue Hue.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Light Sea Blue is more muted than Manganese Blue Hue.
The same difference applies the other way round: Manganese Blue Hue is 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 Manganese Blue Hue on the colour wheel See Light Sea Blue on the colour wheel
All matches: Manganese Blue Hue equivalents · Light Sea Blue equivalents