Balthasar Gold vs Rusty Metal

How close are they?

ΔE 17.9, loose: different enough that you should pick on purpose. Rusty Metal is a little lighter, much more muted, warmer than Balthasar Gold.

Can I use Rusty Metal instead of Balthasar Gold?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Rusty Metal is a little lighter, much more muted, warmer than Balthasar Gold.

Can I use Balthasar Gold instead of Rusty Metal?

The same difference applies the other way round: Balthasar Gold is a little darker, much more saturated, cooler.

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.