ΔE 6.2, close: similar, with a visible difference side by side. Sky Type S is a little lighter, cooler than Medium Sea Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Sky Type S is a little lighter, cooler than Medium Sea Grey.
The same difference applies the other way round: Medium Sea Grey is a little darker, warmer.
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.
See Medium Sea Grey on the colour wheel See Sky Type S on the colour wheel
All matches: Medium Sea Grey equivalents · Sky Type S equivalents