ΔE 17.1, loose: different enough that you should pick on purpose. Bitz O'Tin is a little lighter, much more muted, warmer than True Brass.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Bitz O'Tin is a little lighter, much more muted, warmer than True Brass.
The same difference applies the other way round: True Brass is a little darker, much more saturated, cooler.
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 True Brass on the colour wheel See Bitz O'Tin on the colour wheel
All matches: True Brass equivalents · Bitz O'Tin equivalents