ΔE 14.2, fair: the same colour family, but not a straight swap. Light Blue Green is a little lighter, more saturated, warmer than Phthalo Turquoise Light.
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, more saturated, warmer than Phthalo Turquoise Light.
The same difference applies the other way round: Phthalo Turquoise Light is a little darker, more muted, cooler.
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 Phthalo Turquoise Light on the colour wheel See Light Blue Green on the colour wheel
All matches: Phthalo Turquoise Light equivalents · Light Blue Green equivalents