ΔE 8.3, close: similar, with a visible difference side by side. Runefang Steel is a little lighter than Natural Steel.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Runefang Steel is a little lighter than Natural Steel.
The same difference applies the other way round: Natural 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.
See Natural Steel on the colour wheel See Runefang Steel on the colour wheel
All matches: Natural Steel equivalents · Runefang Steel equivalents