Gun Chrome vs Silver

How close are they?

ΔE 17.2, loose: different enough that you should pick on purpose. Silver is noticeably darker, more muted than Gun Chrome.

Can I use Silver instead of Gun Chrome?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Silver is noticeably darker, more muted than Gun Chrome.

Can I use Gun Chrome instead of Silver?

The same difference applies the other way round: Gun Chrome is noticeably lighter, more saturated.

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.