How long before second hair transplant hairline correction?

I had an FUE hair transplant to my crown area. After the procedure I regretted not bringing the hairline at the temples lower, as it still looks like a receding hairline. I am going back to have a second small transplant to bring the temple hair lines a little lower. I’ve provisionally booked this for 12 weeks after the original transplant. Is this ok? How long should be left between the two procedures? Also, would the donor area need to differ from the original donor area? Thanks