ΔE 18.5, loose: different enough that you should pick on purpose. Quinacridone Magenta is a little lighter, much more saturated, warmer than Rebel Red.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Quinacridone Magenta is a little lighter, much more saturated, warmer than Rebel Red.
The same difference applies the other way round: Rebel Red is a little darker, much more muted, 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 Rebel Red on the colour wheel See Quinacridone Magenta on the colour wheel
All matches: Rebel Red equivalents · Quinacridone Magenta equivalents