ΔE 7.7, close: similar, with a visible difference side by side. Tarnished Brass is a little darker, more saturated than Tainted Gold.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Tarnished Brass is a little darker, more saturated than Tainted Gold.
The same difference applies the other way round: Tainted Gold is a little 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 Tainted Gold on the colour wheel See Tarnished Brass on the colour wheel
All matches: Tainted Gold equivalents · Tarnished Brass equivalents