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My two bits:
The canon Perturabo is very much a glory and approval seeker, wanting praise and to know that he is respected, particularly from the Emperor who he saw as the ultimate form of approval. That, and the terror of the Eye of terror.
TalOS while, respecting his creator, does not derive any need of approval from him beyond that of the creator and the created (i.e. serving his purpose). He is confident that whatever he is doing now is within that purpose, having had good open communication with both him and Malcador, as well as the fact that a Tool does not necessarily need praise to serve well (though praise is always welcome, as per the Hymns of Praise to the machine)
TalOS has his faith to prop him up.
Perturabo will be at odds with him unless TalOS does something that fundamentally changes his mind. Perturabo has a disdain for priests and religion, and of the Mechanicus, and was very open of this seeing them little more as the same type of Shamans he shamed on Olympia. TalOS is the head of such a church and that will be an impediment in our way.
Perturabo will want all his brothers approval, or at least the sense that his brothers praise his hard work and efforts. This is in contrast to TalOS who frankly might not give two shits if others don't approve, even Russ or Dorn, because he is confident in his own efforts in the name of his God. And that he is also already successful anyway. Which is why Fulgrim does not bother him. I'm not sure how much TalOS can do offering his approval alone, as Magnus did the same, but Perty still ended up wanting more.
Also I do think TalOS would be very much against decimation, and the temptation for sanction is real. In the very least TalOS might offer to ask him to give him the unwanted and undesirables. I think that would be very based if TalOS welcomed any and all rejected, because he is quite capable of improving even the lowliest to greatness thanks to the power of the Machine God and science.
Basically we are going to be naturally set p for bad blood. So I'm curious to see if TalOS can be clever enough to avoid it.