ΔE 14.9, fair: the same colour family, but not a straight swap. Granite Stone is noticeably darker than Spaceship Exterior.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Granite Stone is noticeably darker than Spaceship Exterior.
The same difference applies the other way round: Spaceship Exterior is noticeably 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 Granite Stone on the colour wheel
All matches: Spaceship Exterior equivalents · Granite Stone equivalents