ΔE 4.2, very close: most people won’t see a difference side by side. Titanium White is a little lighter than Spaceship Exterior. They are different kinds of paint: Army Painter Spaceship Exterior is an opaque base/layer paint and Golden Titanium White is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 4). Titanium White is a little lighter than Spaceship Exterior. They are different kinds of paint.
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 Titanium White on the colour wheel
All matches: Spaceship Exterior equivalents · Titanium White equivalents