I got my blight kings the other day, and I would disagree with the blight kings heads fitting. They look way smaller, and don't fit like a DG helmet that sits down into the neck. The BK heads fit onto a sided neck joint, so there's no back to the heads. While it might be possible to make a bare head swap or two with a lot of gs work, I don't think the work required might not be worth it. I'll take a couple of photos later for you.