ΔE 15.2, loose: different enough that you should pick on purpose. Red Rage is a little darker, more muted than Ruddy Terra.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Red Rage is a little darker, more muted than Ruddy Terra.
The same difference applies the other way round: Ruddy Terra is a little lighter, more saturated.
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 Ruddy Terra on the colour wheel See Red Rage on the colour wheel
All matches: Ruddy Terra equivalents · Red Rage equivalents