ΔE 9.7, close: similar, with a visible difference side by side. Bright Gun Metal is a little lighter, more saturated than Broadsword Silver.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Bright Gun Metal is a little lighter, more saturated than Broadsword Silver.
The same difference applies the other way round: Broadsword Silver is a little darker, 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.
See Broadsword Silver on the colour wheel See Bright Gun Metal on the colour wheel
All matches: Broadsword Silver equivalents · Bright Gun Metal equivalents