ΔE 8.0, close: similar, with a visible difference side by side. Oxford Blue is a little lighter, more saturated, cooler than Terrestrial Titan.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Oxford Blue is a little lighter, more saturated, cooler than Terrestrial Titan.
The same difference applies the other way round: Terrestrial Titan is a little darker, more muted, 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 Terrestrial Titan on the colour wheel See Oxford Blue on the colour wheel
All matches: Terrestrial Titan equivalents · Oxford Blue equivalents