ΔE 12.2, fair: the same colour family, but not a straight swap. Obsidian Black is noticeably darker, more muted than Doom Metal.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Obsidian Black is noticeably darker, more muted than Doom Metal.
The same difference applies the other way round: Doom Metal is noticeably lighter, 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 Doom Metal on the colour wheel See Obsidian Black on the colour wheel
All matches: Doom Metal equivalents · Obsidian Black equivalents