ΔE 10.4, fair: the same colour family, but not a straight swap. Royal Purple is a little darker, more muted than Eidolon Purple Clear.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Royal Purple is a little darker, more muted than Eidolon Purple Clear.
The same difference applies the other way round: Eidolon Purple Clear 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 Eidolon Purple Clear on the colour wheel See Royal Purple on the colour wheel
All matches: Eidolon Purple Clear equivalents · Royal Purple equivalents