ΔE 11.6, fair: the same colour family, but not a straight swap. Lothern Blue is more muted, cooler than Lightning Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Lothern Blue is more muted, cooler than Lightning Blue.
The same difference applies the other way round: Lightning Blue is more saturated, 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 Lightning Blue on the colour wheel See Lothern Blue on the colour wheel
All matches: Lightning Blue equivalents · Lothern Blue equivalents