Skeleton Bone vs IJA Grey Green

How close are they?

ΔE 7.5, close: similar, with a visible difference side by side. IJA Grey Green is a little darker, cooler than Skeleton Bone.

Can I use IJA Grey Green instead of Skeleton Bone?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). IJA Grey Green is a little darker, cooler than Skeleton Bone.

Can I use Skeleton Bone instead of IJA Grey Green?

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

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.