ΔE 11.5, fair: the same colour family, but not a straight swap. Flat White is noticeably lighter, more muted than Brainmatter Beige.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Flat White is noticeably lighter, more muted than Brainmatter Beige.
The same difference applies the other way round: Brainmatter Beige is noticeably darker, more saturated.
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 Flat White on the colour wheel
All matches: Brainmatter Beige equivalents · Flat White equivalents