ΔE 9.9, close: similar, with a visible difference side by side. Oxford Blue is a little darker, cooler than Dead Purple.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Oxford Blue is a little darker, cooler than Dead Purple.
The same difference applies the other way round: Dead Purple is a little lighter, warmer.
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 Dead Purple on the colour wheel See Oxford Blue on the colour wheel
All matches: Dead Purple equivalents · Oxford Blue equivalents