same material, one is darker I've a simple scene with two objects with the same material. 
Strangely, one of them is darker and I just can't figure it out why. 
No it's not their normals, I've already checked it.

Here's the scene:


Normals:


They don't have any textures. The worst is, if I export it into unity, the problem persists, so clearly something is wrong here, I just don't know what.

Any ideas?

Thanks!
From a comment by mr-zac


  Those are custom split normals.
  Either remove them, or uncheck AutoSmooth.