User blog comment:Macchinno/First progenitor/@comment-31.218.96.83-20170717044255

ResidentialPsycho but I dont think that very correct !

Yes, maybe they're different but there have to be a connection between the two of them.

As I remmber in chapter 57 "Defining a King" When Shigama Doji start possesing Kureto at the same moment the chapter shows and Shinoa felt some pain (maybe in her heart), then Yu asks her and she said she is fine, even Mahiru noticed that !

Source 1: http://mangafox.me/manga/owari_no_seraph/vTBD/c057/32.html(Complete to see)

'''Yet there are diffrences between the two ! espically in the shape and the abilities, So I guess they're maybe diffrent but somehow connected.'''

And the experiment that was perferomd on Shinoa was  leaded  by her father (Who as far we know controlled by Shigama doji) 

What proves that is when Shigama doji controlled the seraph and order it to stop and said that its his experiment !

Sources 2: http://mangafox.me/manga/owari_no_seraph/vTBD/c057/31.html