Warp Lightning vs Bag of Bones

How close are they?

ΔE 49.9, loose: different enough that you should pick on purpose. Bag of Bones is noticeably darker, much more muted, warmer than Warp Lightning.

Can I use Bag of Bones instead of Warp Lightning?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 50). Bag of Bones is noticeably darker, much more muted, warmer than Warp Lightning.

Can I use Warp Lightning instead of Bag of Bones?

The same difference applies the other way round: Warp Lightning is noticeably lighter, much 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.