ΔE 6.5, close: similar, with a visible difference side by side. Quartz Skin is more saturated, warmer than Bony Spikes.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Quartz Skin is more saturated, warmer than Bony Spikes.
The same difference applies the other way round: Bony Spikes is 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 Bony Spikes on the colour wheel See Quartz Skin on the colour wheel
All matches: Bony Spikes equivalents · Quartz Skin equivalents