ΔE 11.1, fair: the same colour family, but not a straight swap. J.N. Gray is noticeably darker than Brainmatter Beige.
Can I use J.N. Gray instead of Brainmatter Beige?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). J.N. Gray is noticeably darker than Brainmatter Beige.
Can I use Brainmatter Beige instead of J.N. Gray?
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.