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