ΔE 11.9, fair: the same colour family, but not a straight swap. Translucent Light Blue is noticeably lighter than Arctic Gem.
Can I use Translucent Light Blue instead of Arctic Gem?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Translucent Light Blue is noticeably lighter than Arctic Gem.
Can I use Arctic Gem instead of Translucent Light Blue?
The same difference applies the other way round: Arctic Gem is noticeably darker.
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.