Medium Sea Grey vs Dusty Skull

How close are they?

ΔE 6.3, close: similar, with a visible difference side by side. Dusty Skull is a little darker, warmer than Medium Sea Grey.

Can I use Dusty Skull instead of Medium Sea Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Dusty Skull is a little darker, warmer than Medium Sea Grey.

Can I use Medium Sea Grey instead of Dusty Skull?

The same difference applies the other way round: Medium Sea Grey is a little lighter, 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.