ΔE 6.8, close: similar, with a visible difference side by side. Glossy Sea Blue is more muted than Russian Blue Lights.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Glossy Sea Blue is more muted than Russian Blue Lights.
The same difference applies the other way round: Russian Blue Lights 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 Russian Blue Lights on the colour wheel See Glossy Sea Blue on the colour wheel
All matches: Russian Blue Lights equivalents · Glossy Sea Blue equivalents