ΔE 16.3, loose: different enough that you should pick on purpose. Turquoise is much more saturated, warmer than AMT-7 Light Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Turquoise is much more saturated, warmer than AMT-7 Light Blue.
The same difference applies the other way round: AMT-7 Light Blue is much 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 AMT-7 Light Blue on the colour wheel See Turquoise on the colour wheel
All matches: AMT-7 Light Blue equivalents · Turquoise equivalents