ΔE 11.6, fair: the same colour family, but not a straight swap. Metallic Brown is more saturated than Fulgurite Copper.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Metallic Brown is more saturated than Fulgurite Copper.
The same difference applies the other way round: Fulgurite Copper is 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 Fulgurite Copper on the colour wheel See Metallic Brown on the colour wheel
All matches: Fulgurite Copper equivalents · Metallic Brown equivalents