ΔE 12.3, fair: the same colour family, but not a straight swap. Obsidian Black is noticeably darker than Leadbelcher.
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 than Leadbelcher.
The same difference applies the other way round: Leadbelcher is noticeably lighter.
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 Leadbelcher on the colour wheel See Obsidian Black on the colour wheel
All matches: Leadbelcher equivalents · Obsidian Black equivalents