ΔE 11.1, fair: the same colour family, but not a straight swap. Dark Gull Gray is noticeably darker than N6 Neutral Gray.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Dark Gull Gray is noticeably darker than N6 Neutral Gray.
The same difference applies the other way round: N6 Neutral Gray 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 N6 Neutral Gray on the colour wheel See Dark Gull Gray on the colour wheel
All matches: N6 Neutral Gray equivalents · Dark Gull Gray equivalents