ΔE 11.3, fair: the same colour family, but not a straight swap. Eldar Robe is a little darker, more saturated, warmer than Imrik Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Eldar Robe is a little darker, more saturated, warmer than Imrik Blue.
The same difference applies the other way round: Imrik Blue is a little lighter, 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 Imrik Blue on the colour wheel See Eldar Robe on the colour wheel
All matches: Imrik Blue equivalents · Eldar Robe equivalents