ΔE 14.0, fair: the same colour family, but not a straight swap. Old Gold is a little darker, more saturated, warmer than Black Metal.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Old Gold is a little darker, more saturated, warmer than Black Metal.
The same difference applies the other way round: Black Metal is a little lighter, more muted, cooler.
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 Black Metal on the colour wheel See Old Gold on the colour wheel
All matches: Black Metal equivalents · Old Gold equivalents