Temple Stone vs Russian AF Grey N.4

How close are they?

ΔE 9.5, close: similar, with a visible difference side by side. Russian AF Grey N.4 is a little lighter, cooler than Temple Stone.

Can I use Russian AF Grey N.4 instead of Temple Stone?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Russian AF Grey N.4 is a little lighter, cooler than Temple Stone.

Can I use Temple Stone instead of Russian AF Grey N.4?

The same difference applies the other way round: Temple Stone 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.