ΔE 14.6, fair: the same colour family, but not a straight swap. Light Emerald is noticeably darker, more muted than Light Turquoise.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Light Emerald is noticeably darker, more muted than Light Turquoise.
The same difference applies the other way round: Light Turquoise is noticeably lighter, more saturated.
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 Light Turquoise on the colour wheel See Light Emerald on the colour wheel
All matches: Light Turquoise equivalents · Light Emerald equivalents