ΔE 18.8, loose: different enough that you should pick on purpose. Cerberus Brown is noticeably darker, warmer than Space Dust.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Cerberus Brown is noticeably darker, warmer than Space Dust.
The same difference applies the other way round: Space Dust is noticeably lighter, cooler.
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 Cerberus Brown on the colour wheel
All matches: Space Dust equivalents · Cerberus Brown equivalents