ΔE 11.4, fair: the same colour family, but not a straight swap. Light Emerald is noticeably lighter, cooler than Aquatic Turquoise.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Light Emerald is noticeably lighter, cooler than Aquatic Turquoise.
The same difference applies the other way round: Aquatic Turquoise 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 Aquatic Turquoise on the colour wheel See Light Emerald on the colour wheel
All matches: Aquatic Turquoise equivalents · Light Emerald equivalents