Gun Metal vs Natural Steel

How close are they?

ΔE 6.0, close: similar, with a visible difference side by side. Natural Steel is a little darker, more saturated than Gun Metal.

Can I use Natural Steel instead of Gun Metal?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Natural Steel is a little darker, more saturated than Gun Metal.

Can I use Gun Metal instead of Natural Steel?

The same difference applies the other way round: Gun Metal is a little lighter, more muted.

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.