ΔE 14.2, fair: the same colour family, but not a straight swap. Tidal Blue is a little lighter, much more saturated than Night Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Tidal Blue is a little lighter, much more saturated than Night Blue.
The same difference applies the other way round: Night Blue is a little darker, much more muted.
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 Night Blue on the colour wheel See Tidal Blue on the colour wheel
All matches: Night Blue equivalents · Tidal Blue equivalents