Bone vs Bony Spikes

How close are they?

ΔE 7.9, close: similar, with a visible difference side by side. Bony Spikes is a little darker, more muted, warmer than Bone.

Can I use Bony Spikes instead of Bone?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Bony Spikes is a little darker, more muted, warmer than Bone.

Can I use Bone instead of Bony Spikes?

The same difference applies the other way round: Bone is a little lighter, more saturated, 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.