Obsidian Pigment Toner vs Dark Blue Grey

How close are they?

ΔE 9.3, close: similar, with a visible difference side by side. Dark Blue Grey is more muted than Obsidian Pigment Toner.

Can I use Dark Blue Grey instead of Obsidian Pigment Toner?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Dark Blue Grey is more muted than Obsidian Pigment Toner.

Can I use Obsidian Pigment Toner instead of Dark Blue Grey?

The same difference applies the other way round: Obsidian Pigment Toner is more saturated.

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.