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