ΔE 7.2, close: similar, with a visible difference side by side. JASDF Shallow Ocean Blue is more saturated than Russ Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). JASDF Shallow Ocean Blue is more saturated than Russ Grey.
The same difference applies the other way round: Russ Grey is more muted.
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 Russ Grey on the colour wheel See JASDF Shallow Ocean Blue on the colour wheel
All matches: Russ Grey equivalents · JASDF Shallow Ocean Blue equivalents