ΔE 13.8, fair: the same colour family, but not a straight swap. Light Blue Green is a little lighter, cooler than Light Turquois (Phthalo).
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Light Blue Green is a little lighter, cooler than Light Turquois (Phthalo).
The same difference applies the other way round: Light Turquois (Phthalo) is a little 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 Light Turquois (Phthalo) on the colour wheel See Light Blue Green on the colour wheel
All matches: Light Turquois (Phthalo) equivalents · Light Blue Green equivalents