ΔE 7.8, close: similar, with a visible difference side by side. Ocean Gray is a little lighter, warmer than Shadow Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Ocean Gray is a little lighter, warmer than Shadow Blue.
The same difference applies the other way round: Shadow Blue is a little darker, 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.
See Shadow Blue on the colour wheel See Ocean Gray on the colour wheel
All matches: Shadow Blue equivalents · Ocean Gray equivalents