Runefang Steel vs Tinmetal Grey

How close are they?

ΔE 8.6, close: similar, with a visible difference side by side. Tinmetal Grey is a little lighter than Runefang Steel.

Can I use Tinmetal Grey instead of Runefang Steel?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Tinmetal Grey is a little lighter than Runefang Steel.

Can I use Runefang Steel instead of Tinmetal Grey?

The same difference applies the other way round: Runefang Steel is a little darker.

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.