ΔE 11.4, fair: the same colour family, but not a straight swap. Carcharodon Grey is noticeably darker than Longbeard Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Carcharodon Grey is noticeably darker than Longbeard Grey.
The same difference applies the other way round: Longbeard Grey 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 Longbeard Grey on the colour wheel See Carcharodon Grey on the colour wheel
All matches: Longbeard Grey equivalents · Carcharodon Grey equivalents