ΔE 5.4, very close: most people won’t see a difference side by side. Light Gun Metal is a little darker than Grey Knights Steel.
Yes, for most jobs. Very close match (ΔE 5). Light Gun Metal is a little darker than Grey Knights Steel.
The same difference applies the other way round: Grey Knights Steel is a little lighter.
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 Grey Knights Steel on the colour wheel See Light Gun Metal on the colour wheel
All matches: Grey Knights Steel equivalents · Light Gun Metal equivalents