ΔE 9.0, close: similar, with a visible difference side by side. Ocean Gray is a little darker, more saturated, warmer than Celestra Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Ocean Gray is a little darker, more saturated, warmer than Celestra Grey.
The same difference applies the other way round: Celestra Grey is a little lighter, more muted, 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 Celestra Grey on the colour wheel See Ocean Gray on the colour wheel
All matches: Celestra Grey equivalents · Ocean Gray equivalents