ΔE 8.8, close: similar, with a visible difference side by side. Dark Gray (Dunkel Grau) is a little lighter than Deep Ocean Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Dark Gray (Dunkel Grau) is a little lighter than Deep Ocean Blue.
The same difference applies the other way round: Deep Ocean Blue is a little darker.
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 Deep Ocean Blue on the colour wheel See Dark Gray (Dunkel Grau) on the colour wheel
All matches: Deep Ocean Blue equivalents · Dark Gray (Dunkel Grau) equivalents