Again, if verteporfin causes new follicles to be produced rather than rejuvenating old follicles, then the state of any existing follicles is less relevant.
Also, the difference between follicles in the crown vs in the donor region is not their DNA. It wouldn't take DNA mutation to make the follicles resistant (I'm NOT saying verteporfin would do this, I'm just addressing your remark about mutation). All cells in the body, aside from things like gametes, have identical DNA. There can be some very small variations due to sporadic mutations or telomeres but those are negligible.
The differences between those two hair follicle cells is in their states, such as their epigenetic configurations (i.e. DNA methylation, histone modifications), protein markings, etc, rather than the DNA itself. It's also how stem cells are differentiated and dedifferentiated.