ΔE 14.9, fair: the same colour family, but not a straight swap. Light Blue is noticeably lighter, cooler than Arctic Gem.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Light Blue is noticeably lighter, cooler than Arctic Gem.
The same difference applies the other way round: Arctic Gem is noticeably 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 Arctic Gem on the colour wheel See Light Blue on the colour wheel
All matches: Arctic Gem equivalents · Light Blue equivalents