ΔE 20.3, loose: different enough that you should pick on purpose. Light Emerald is noticeably darker, much more muted than Tropical Turquoise.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Light Emerald is noticeably darker, much more muted than Tropical Turquoise.
The same difference applies the other way round: Tropical Turquoise is noticeably lighter, much 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 Tropical Turquoise on the colour wheel See Light Emerald on the colour wheel
All matches: Tropical Turquoise equivalents · Light Emerald equivalents