ΔE 20.4, loose: different enough that you should pick on purpose. Turquoise is noticeably darker, cooler than Meredius Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Turquoise is noticeably darker, cooler than Meredius Blue.
The same difference applies the other way round: Meredius Blue is noticeably lighter, 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 Meredius Blue on the colour wheel See Turquoise on the colour wheel
All matches: Meredius Blue equivalents · Turquoise equivalents