ΔE 17.9, loose: different enough that you should pick on purpose. Clear Plum is a little darker, more saturated, cooler than Murder Scene. They are different kinds of paint: Army Painter Murder Scene is a one-coat contrast-style paint and Reaper Clear Plum is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Clear Plum is a little darker, more saturated, cooler than Murder Scene. They are different kinds of paint.
The same difference applies the other way round: Murder Scene is a little lighter, 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 Murder Scene on the colour wheel See Clear Plum on the colour wheel
All matches: Murder Scene equivalents · Clear Plum equivalents