Deep Ocean Blue vs Chancellor Blue

How close are they?

ΔE 7.3, close: similar, with a visible difference side by side. Chancellor Blue is warmer than Deep Ocean Blue.

Can I use Chancellor Blue instead of Deep Ocean Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Chancellor Blue is warmer than Deep Ocean Blue.

Can I use Deep Ocean Blue instead of Chancellor Blue?

The same difference applies the other way round: Deep Ocean 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.