Are these two really related?!

I mean just look at them! One's has a heart and a kind face and the other has a knife and has an "I want to kill you" face! HOW COULD THEY POSSIBLY BE RELEATED?
...
While Kaito has is little freak out up there, let’s get to business.
Models used: Tda Miku Append ver 1.03 by

All credit of this model goes to TOUKO-P!
And Zatsune Miku Append 2.0 by

All credit of this edit goes to Senrosa!
(But credit goes to TDA for the original model this edit is based off of)
They can be found here
[link]
And here
[link]
Poses by: Me
Accessories used:
Blue crystal heart and Knife with chain
All credit of the heart goes to:

And all credit of the knife goes to:

They can be found here
[link]
And here
[link]
Effect used: Serious shader
I found it on MMD Wikia
All credit of the effect goes to its original owner!
Made with MMD and MME
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Hatsune Miku is owned, created, and © to Crypton Future Media, Zatsune Miku is owned, and created by its original creator, The Tda Miku Append ver. 1.03 model is created and belongs to TOUKO-P, The Zatsune 2.0 model is owned and created by Senrosa, The blue crystal heart is owned and created by ATLD0107, The knife with chain is owned and created by The-Horrible-Mu, The poses are owned and created by me, The serious shader effect is created and owned by its original creator, MikuMikuDance is owned created and © by Yu Higuchi, and MikuMikuEffect is owned, created and © by its original Japanese creator!!!! This is for entertainment purposes only!!!!!!! No copyright infringement is intended!!!!!!!!!!!!!!
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Enjoy~!
~Link-Pikachu