ΔE 9.3, close: similar, with a visible difference side by side. Genestealer Purple is more saturated than Warlock Magenta.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Genestealer Purple is more saturated than Warlock Magenta.
The same difference applies the other way round: Warlock Magenta is more muted.
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 Warlock Magenta on the colour wheel See Genestealer Purple on the colour wheel
All matches: Warlock Magenta equivalents · Genestealer Purple equivalents