Grey-Blue vs Russ. AF Grey N.8

How close are they?

ΔE 11.6, fair: the same colour family, but not a straight swap. Russ. AF Grey N.8 is more muted, cooler than Grey-Blue.

Can I use Russ. AF Grey N.8 instead of Grey-Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Russ. AF Grey N.8 is more muted, cooler than Grey-Blue.

Can I use Grey-Blue instead of Russ. AF Grey N.8?

The same difference applies the other way round: Grey-Blue 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.