ΔE 5.7, very close: most people won’t see a difference side by side. German Gray is a little lighter, cooler than Obsidian Pigment Toner.
Yes, for most jobs. Very close match (ΔE 6). German Gray is a little lighter, cooler than Obsidian Pigment Toner.
The same difference applies the other way round: Obsidian Pigment Toner is a little darker, 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 Obsidian Pigment Toner on the colour wheel See German Gray on the colour wheel
All matches: Obsidian Pigment Toner equivalents · German Gray equivalents