Can You Change Your Hair Texture with Surgery?

Although hair texture can not be changed hair density can be changed by HT and some supporting treatments like PRP. 

Thank you for your question.
There is no way to change the hair texture with
surgery.
Hair texture cannot reliably be altered surgically.
On the other hand, certain hair care products,
chemical treatments and hormonal changes such as pregnancy or thyroid issues
can affect the texture of the hair.
But the results of all these affects are very
unpredictable.

There is no way to change the hair texture with surgery.  Certain hair care products and chemical treatments can affect the texture of the hair.  Topical treatments like minoxidil may also affect the texture, as can hormonal changes such as pregnancy or thyroid issues, but all of these are very unpredictable.
All the best,

You cannot change your hair texture with surgery.  Hair transplant is moving hair from a donor area to a new recipient area.  The hair texture will remain the same as where you harvested the hair follicle.

The texture of your hair cannot be altered surgically.  That being said, the texture at the base of the neck is finer than middle of the back of the head, and body hair and facial hair have different textures.  All can be used for transplantation using FUE.  However, it is impractical to use these hairs just to change texture.