ΔE 21.3, loose: different enough that you should pick on purpose. Champagne Gold Anodized Aluminum is noticeably lighter, more muted, cooler than Skullcrusher Brass.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Champagne Gold Anodized Aluminum is noticeably lighter, more muted, cooler than Skullcrusher Brass.
The same difference applies the other way round: Skullcrusher Brass is noticeably darker, more saturated, 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 Skullcrusher Brass on the colour wheel See Champagne Gold Anodized Aluminum on the colour wheel
All matches: Skullcrusher Brass equivalents · Champagne Gold Anodized Aluminum equivalents