ΔE 23.3, loose: different enough that you should pick on purpose. Radiant Yellow is much more saturated, cooler than Top Brass.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Radiant Yellow is much more saturated, cooler than Top Brass.
The same difference applies the other way round: Top Brass is much more muted, warmer.
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 Top Brass on the colour wheel See Radiant Yellow on the colour wheel
All matches: Top Brass equivalents · Radiant Yellow equivalents