ΔE 12.8, fair: the same colour family, but not a straight swap. Thrash Metal is noticeably darker, more saturated than Leadbelcher.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Thrash Metal is noticeably darker, more saturated than Leadbelcher.
The same difference applies the other way round: Leadbelcher is noticeably lighter, 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 Leadbelcher on the colour wheel See Thrash Metal on the colour wheel
All matches: Leadbelcher equivalents · Thrash Metal equivalents