Snow Blue vs Leviathan Light

How close are they?

ΔE 6.6, close: similar, with a visible difference side by side. Leviathan Light is warmer than Snow Blue.

Can I use Leviathan Light instead of Snow Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Leviathan Light is warmer than Snow Blue.

Can I use Snow Blue instead of Leviathan Light?

The same difference applies the other way round: Snow Blue is 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.