ΔE 12.8, fair: the same colour family, but not a straight swap. Radome is a little darker, much more saturated than Space Dust.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Radome is a little darker, much more saturated than Space Dust.
The same difference applies the other way round: Space Dust is a little lighter, much more muted.
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 Space Dust on the colour wheel See Radome on the colour wheel
All matches: Space Dust equivalents · Radome equivalents