ΔE 27.4, loose: different enough that you should pick on purpose. Brass is noticeably darker, much more saturated than Holographic Paint.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Brass is noticeably darker, much more saturated than Holographic Paint.
The same difference applies the other way round: Holographic Paint is noticeably lighter, 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 Holographic Paint on the colour wheel See Brass on the colour wheel
All matches: Holographic Paint equivalents · Brass equivalents