well, the latex mask doesn't look very similar to the busts (apart from both being a P2 obviously), check the outer eyebone and the crown.
But the bust in the middle and the bottom bust do look very much the same. Again, check eyebones and most of all that little thorny edge on the outmost and highest crown spur, it looks like a little shark fin, both busts have it and they both lean in the same direction. That's an odd detail.