ΔE 21.1, loose: different enough that you should pick on purpose. Light Turquoise is noticeably lighter, much more saturated, cooler than Payne’s Grey.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Light Turquoise is noticeably lighter, much more saturated, cooler than Payne’s Grey.
The same difference applies the other way round: Payne’s Grey is noticeably darker, much more muted, 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 Payne’s Grey on the colour wheel See Light Turquoise on the colour wheel
All matches: Payne’s Grey equivalents · Light Turquoise equivalents