Russian Blue Lights vs Deep Ocean Blue

How close are they?

ΔE 6.5, close: similar, with a visible difference side by side. Deep Ocean Blue is a little lighter than Russian Blue Lights.

Can I use Deep Ocean Blue instead of Russian Blue Lights?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Deep Ocean Blue is a little lighter than Russian Blue Lights.

Can I use Russian Blue Lights instead of Deep Ocean Blue?

The same difference applies the other way round: Russian Blue Lights 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.