ΔE 10.0, fair: the same colour family, but not a straight swap. Victorian Brass is a little lighter, more muted than True Copper.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Victorian Brass is a little lighter, more muted than True Copper.
The same difference applies the other way round: True Copper is a little darker, 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.
See True Copper on the colour wheel See Victorian Brass on the colour wheel
All matches: True Copper equivalents · Victorian Brass equivalents