Evil Chrome vs Old Copper

How close are they?

ΔE 17.4, loose: different enough that you should pick on purpose. Old Copper is a little darker, much more saturated than Evil Chrome.

Can I use Old Copper instead of Evil Chrome?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Old Copper is a little darker, much more saturated than Evil Chrome.

Can I use Evil Chrome instead of Old Copper?

The same difference applies the other way round: Evil Chrome is a little lighter, much 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.