Light Ghost Gray vs Marine Mist

How close are they?

ΔE 9.3, close: similar, with a visible difference side by side. Marine Mist is a little lighter, more saturated than Light Ghost Gray.

Can I use Marine Mist instead of Light Ghost Gray?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Marine Mist is a little lighter, more saturated than Light Ghost Gray.

Can I use Light Ghost Gray instead of Marine Mist?

The same difference applies the other way round: Light Ghost Gray is a little darker, more muted.

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.