Wolf Grey vs Russ Grey

How close are they?

ΔE 8.4, close: similar, with a visible difference side by side. Russ Grey is more muted, cooler than Wolf Grey.

Can I use Russ Grey instead of Wolf Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Russ Grey is more muted, cooler than Wolf Grey.

Can I use Wolf Grey instead of Russ Grey?

The same difference applies the other way round: Wolf Grey is 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.