ΔE 13.8, fair: the same colour family, but not a straight swap. Ground Is Lava is a little darker, much more saturated than Brazen Copper.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Ground Is Lava is a little darker, much more saturated than Brazen Copper.
The same difference applies the other way round: Brazen Copper 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.
See Brazen Copper on the colour wheel See Ground Is Lava on the colour wheel
All matches: Brazen Copper equivalents · Ground Is Lava equivalents