Is it possible to use back hair and neck hair for transplant to crown? (FUE)

The problem with this is body hair can be different texture and it only grows to a certain length so it is not the best option.

The use of body hairs to provide additional grafts for the scalp is useful for men who have either depleted most if not all of the available scalp donor hair due to previous restoration surgeries or suffer from advanced grades of androgenetic alopecia, where donor scalp hair is inadequate to provide complete or optimal coverage.Based on the photos, I am not sure whether your back and neck hair is suitable for harvesting. I would suggest you visit a surgeon in your area for an in-office evaluation.