ΔE 37.8, loose: different enough that you should pick on purpose. Payne’s Grey Wash is a little lighter, much more muted, cooler than Purple Tone.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 38). Payne’s Grey Wash is a little lighter, much more muted, cooler than Purple Tone.
The same difference applies the other way round: Purple Tone is a little darker, much 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 Purple Tone on the colour wheel See Payne’s Grey Wash on the colour wheel
All matches: Purple Tone equivalents · Payne’s Grey Wash equivalents