Eyebrow and scalp hair transplants will fall into the same category of micro-grafting. However, there are different approaches to performing this both types of transplantation. This is due to the differences between the two kinds of hair, evidently in their length, strand and angle.
In scalp hair transplants, the procedure will consist of using naturally growing follicular units containing 1-4 hairs. This number of hairs is good enough to achieve the natural look.
For eyebrow transplants, the procedure will consist of using individual hair follicles to be inserted; one hair for each minute puncture. A more meticulous process will be employed for one thing: the direction of eyebrow hair. This direction will depend on the part of the brow where it is growing from. The hair usually forms a pattern that subtly comes together to form an ascent following the normal curve of the brow.
Another thing is that eyebrow hair also grows from the follicle at a sharp angle. This sharp angle will allow the brow hairs to lay flat as compared to scalp hair that grows at a 45-degree angle from the scalp. There should be proper angling of the follicle because it is the most important aspect of any eyebrow transplant.
A third difference is that eyebrow hairs consistently contain single-strand follicles while scalp hair can have as many as four hairs in one follicle.
Finally, consider the lifespan of the hair. Eyebrow hair has a "lifespan" of at least four months before it falls off. Hence, the length is always short. Your scalp hair has a lifespan of about seven years long.