ΔE 7.6, close: similar, with a visible difference side by side. Sky Grey is more muted than IJN Hull Color/Maizuru.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Sky Grey is more muted than IJN Hull Color/Maizuru.
The same difference applies the other way round: IJN Hull Color/Maizuru is more saturated.
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 IJN Hull Color/Maizuru on the colour wheel See Sky Grey on the colour wheel
All matches: IJN Hull Color/Maizuru equivalents · Sky Grey equivalents