ΔE 10.4, fair: the same colour family, but not a straight swap. Medium Brown is a little lighter than Starship Sludge Bay.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Medium Brown is a little lighter than Starship Sludge Bay.
The same difference applies the other way round: Starship Sludge Bay 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 Starship Sludge Bay on the colour wheel See Medium Brown on the colour wheel
All matches: Starship Sludge Bay equivalents · Medium Brown equivalents