ΔE 11.5, fair: the same colour family, but not a straight swap. White Blue is a little lighter, cooler than Marine Mist.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). White Blue is a little lighter, cooler than Marine Mist.
The same difference applies the other way round: Marine Mist is a little darker, warmer.
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 Marine Mist on the colour wheel See White Blue on the colour wheel
All matches: Marine Mist equivalents · White Blue equivalents