ΔE 14.5, fair: the same colour family, but not a straight swap. Light Turquoise is a little darker, more muted, cooler than True Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Light Turquoise is a little darker, more muted, cooler than True Blue.
The same difference applies the other way round: True Blue is a little lighter, more saturated, 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 True Blue on the colour wheel See Light Turquoise on the colour wheel
All matches: True Blue equivalents · Light Turquoise equivalents