ΔE 12.3, fair: the same colour family, but not a straight swap. Ground Is Lava is more saturated, cooler than Red Copper.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Ground Is Lava is more saturated, cooler than Red Copper.
The same difference applies the other way round: Red Copper is more muted, warmer.
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 Red Copper on the colour wheel See Ground Is Lava on the colour wheel
All matches: Red Copper equivalents · Ground Is Lava equivalents