ΔE 14.5, fair: the same colour family, but not a straight swap. Royal Purple is noticeably darker, warmer than Blue FS15050.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Royal Purple is noticeably darker, warmer than Blue FS15050.
The same difference applies the other way round: Blue FS15050 is noticeably lighter, 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 Blue FS15050 on the colour wheel See Royal Purple on the colour wheel
All matches: Blue FS15050 equivalents · Royal Purple equivalents