ΔE 22.8, loose: different enough that you should pick on purpose. Copper is a little lighter, much more saturated than True Copper.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Copper is a little lighter, much more saturated than True Copper.
The same difference applies the other way round: True Copper is a little darker, 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.
See True Copper on the colour wheel See Copper on the colour wheel
All matches: True Copper equivalents · Copper equivalents