ΔE 6.3, close: similar, with a visible difference side by side. Payne's Gray is more saturated, cooler than Occultist Cloak. They are different kinds of paint: Army Painter Occultist Cloak is a one-coat contrast-style paint and Golden Payne's Gray is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Payne's Gray is more saturated, cooler than Occultist Cloak. They are different kinds of paint.
The same difference applies the other way round: Occultist Cloak is 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 Occultist Cloak on the colour wheel See Payne's Gray on the colour wheel
All matches: Occultist Cloak equivalents · Payne's Gray equivalents