An ideal organ transportation is within the same person - that way, that person's immunological system won't attack that person's new organ.
Such transplantations are actually happening at times, in the case of skin drafts - a person's skin can be transplanted into another part of their body.
The changes that is happening on Amber is the development of
secondary sex characteristics in which an individual undergoing puberty is
likely to have changes in his or her private body parts in the body such as the
breast and pubic area in some sensitive parts.