ΔE 19.1, loose: different enough that you should pick on purpose. Aged Metal is a little lighter, much more saturated than Thrash Metal.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Aged Metal is a little lighter, much more saturated than Thrash Metal.
The same difference applies the other way round: Thrash Metal is a little 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 Thrash Metal on the colour wheel See Aged Metal on the colour wheel
All matches: Thrash Metal equivalents · Aged Metal equivalents