ΔE 14.6, fair: the same colour family, but not a straight swap. Brassy Brass is a little lighter, warmer than Radiant Platinum.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Brassy Brass is a little lighter, warmer than Radiant Platinum.
The same difference applies the other way round: Radiant Platinum is a little darker, 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 Radiant Platinum on the colour wheel See Brassy Brass on the colour wheel
All matches: Radiant Platinum equivalents · Brassy Brass equivalents