ΔE 9.4, close: similar, with a visible difference side by side. Bright Neutral Grey is a little darker than Spaceship Exterior.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Bright Neutral Grey is a little darker than Spaceship Exterior.
The same difference applies the other way round: Spaceship Exterior is a little lighter.
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 Bright Neutral Grey on the colour wheel
All matches: Spaceship Exterior equivalents · Bright Neutral Grey equivalents