ΔE 22.3, loose: different enough that you should pick on purpose. Twilight Rose is noticeably darker, warmer than Morrow Purple.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Twilight Rose is noticeably darker, warmer than Morrow Purple.
The same difference applies the other way round: Morrow Purple 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 Morrow Purple on the colour wheel See Twilight Rose on the colour wheel
All matches: Morrow Purple equivalents · Twilight Rose equivalents