ΔE 11.6, fair: the same colour family, but not a straight swap. Heirloom Gold is a little lighter, more muted than Skullcrusher Brass.
✓ Two Thin Coats comparison chart lists these two as equivalents.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Heirloom Gold is a little lighter, more muted than Skullcrusher Brass.
The same difference applies the other way round: Skullcrusher Brass 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 Skullcrusher Brass on the colour wheel See Heirloom Gold on the colour wheel
All matches: Skullcrusher Brass equivalents · Heirloom Gold equivalents