ΔE 20.6, loose: different enough that you should pick on purpose. Old Gold is a little darker, much more saturated than Black Ice.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Old Gold is a little darker, much more saturated than Black Ice.
The same difference applies the other way round: Black Ice 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 Black Ice on the colour wheel See Old Gold on the colour wheel
All matches: Black Ice equivalents · Old Gold equivalents