ΔE 25.5, loose: different enough that you should pick on purpose. Titanium Gold is noticeably lighter, much more muted than Skullcrusher Brass.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Titanium Gold is noticeably lighter, much more muted than Skullcrusher Brass.
The same difference applies the other way round: Skullcrusher Brass is noticeably darker, much more saturated.
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 Skullcrusher Brass on the colour wheel See Titanium Gold on the colour wheel
All matches: Skullcrusher Brass equivalents · Titanium Gold equivalents