ΔE 10.2, fair: the same colour family, but not a straight swap. Augur Blue is a little lighter, warmer than Whale Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Augur Blue is a little lighter, warmer than Whale Grey.
The same difference applies the other way round: Whale Grey is a little darker, cooler.
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 Whale Grey on the colour wheel See Augur Blue on the colour wheel
All matches: Whale Grey equivalents · Augur Blue equivalents