Well... I do see several differences. First, the Queen from Episodes 13 and 14 was green. This one seems to be greyish white with green and red in its head. It also seems to me that the spiral structure plus its belt is an extension of this Super Queen itself. Perhaps the whole belt is a more advanced stage on Vajra evolution. I wouldn't be surprised if it comes from the Vajra mothership...
Vajra Super Queen = Vajra Empress?