ΔE 14.9, fair: the same colour family, but not a straight swap. Brown Rose is noticeably lighter than Perylene Violet.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Brown Rose is noticeably lighter than Perylene Violet.
The same difference applies the other way round: Perylene Violet is noticeably darker.
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 Perylene Violet on the colour wheel See Brown Rose on the colour wheel
All matches: Perylene Violet equivalents · Brown Rose equivalents