Can hair texture be changed by theoretically transplanting hair from one person to another? (Photo)

You can't transplant another person's hair to your scalp. Unless you they are your identical twin.  Otherwise, your body will reject it.

Hair texture is determined by genetics. And DNA governs the
shape of the follicle and how the hair is produced within these structures.

Follicles cannot be transferred from a different person. The
only exception would be in the case of identical twins. However, they would
have the same hair texture. Theoretically, if follicles could be safely and reliable
transferred from other people, the hair would maintain its original texture due
to the DNA codes which reside in the cells of these structures.

Every person has a different protein signature. And this
would trigger a response from your immune system. This would involve an
aggressive attack on the follicles since the immune system recognizes them as
being foreign to the body. Therefore the grafts would not survive.

Immunosuppressant drugs would create additional
complications and lower your body’s defense, making you vulnerable to various
diseases and infections. 

It is not possible to transfer one person's hair to another. The body will absolutely reject the foreign hair.