SN74LV4046A: How does PCout act when the Vcxo controlled by this IC and the Vcxo making the reference clock are the same?

Now i use it as only phase comparator ( meaning i don't use its VCO).on my apprication, there is another Vcxo on the circit.

Then,how will PCout act when i put the same Vcxo clock to each of SIGin and Comp_in?
 In other words,The Vcxo controlled by this IC and the Vcxo making the reference clock are the same on my apprication.

I attached a file showing the consituation.PLL curcit.pptx