ΔE 18.4, loose: different enough that you should pick on purpose. Necro Gold is noticeably lighter, much more saturated than Death Metal.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Necro Gold is noticeably lighter, much more saturated than Death Metal.
The same difference applies the other way round: Death Metal is noticeably darker, 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 Death Metal on the colour wheel See Necro Gold on the colour wheel
All matches: Death Metal equivalents · Necro Gold equivalents