Warpfiend Grey vs Runic Purple

How close are they?

ΔE 10.8, fair: the same colour family, but not a straight swap. Runic Purple is noticeably lighter than Warpfiend Grey.

Can I use Runic Purple instead of Warpfiend Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Runic Purple is noticeably lighter than Warpfiend Grey.

Can I use Warpfiend Grey instead of Runic Purple?

The same difference applies the other way round: Warpfiend Grey is noticeably darker.

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.