ΔE 11.2, fair: the same colour family, but not a straight swap. Ivory Tusk is noticeably darker than Brainmatter Beige.
✓ Two Thin Coats comparison chart lists these two as equivalents.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Ivory Tusk is noticeably darker than Brainmatter Beige.
The same difference applies the other way round: Brainmatter Beige 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 Brainmatter Beige on the colour wheel See Ivory Tusk on the colour wheel
All matches: Brainmatter Beige equivalents · Ivory Tusk equivalents