FUE - will old hair still grow back after FUE hair transplant? (photos)

Hello, below is a photo of my hair before and after (14 days post op) FUE hair transplant. I have been told that the implanted hairs will fall out and this is called shock loss and that they will begin to grow again after 3 months post op. What I wanted to know is what about the hair I had from before, will that grow back too? If so, when will that grow back? Once the implanted hairs fall? After 3 months at the same time as the new hair? Thank you.