Seraphon Blue vs Light Blue Green

How close are they?

ΔE 7.9, close: similar, with a visible difference side by side. Light Blue Green is a little lighter than Seraphon Blue.

Can I use Light Blue Green instead of Seraphon Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Light Blue Green is a little lighter than Seraphon Blue.

Can I use Seraphon Blue instead of Light Blue Green?

The same difference applies the other way round: Seraphon Blue is a little darker.

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.