A friend from the US shared this with me regarding Catholicism and Gender Identity
“DOCTRINAL NOTE ON THE MORAL LIMITS TO TECHNOLOGICAL MANIPULATION OF THE HUMAN BODY
Committee on Doctrine
United States Conference of Catholic Bishops
- Modern technology offers an ever-increasing range of means—chemical, surgical, genetic—for intervening in the functioning of the human body, as well as for modifying its appearance. These technological developments have provided the ability to cure many human maladies and promise to cure many more. This has been a great boon to humanity. Modern technology, however, produces possibilities not only for helpful interventions, but also for interventions that are injurious to the true flourishing of the human person. Careful moral discernment is needed to determine which possibilities should be realized and which should not, in order to promote the good of the human person. To do this discernment, it is necessary to employ criteria that respect the created order inscribed in our human nature.”
a further extract…
“A crucial aspect of the order of nature created by God is the body-soul unity of each human person. Throughout her history, the Church has opposed dualistic conceptions of the human person that do not regard the body as an intrinsic part of the human person, as if the soul were essentially complete in itself and the body were merely an instrument used by the soul.5 In opposition to dualisms both ancient and modern, the Church has always maintained that, while there is a distinction between the soul and the body, both are constitutive of what it means to be human, since spirit and matter, in human beings, “are not two natures united, but rather their union forms a single nature.”6 The soul does not come into existence on its own and somehow happen to be in this body, as if it could just as well be in a different body. A soul can never be in another body, much less be in the wrong body. This soul only comes into existence together with this body. What it means to be a human person necessarily includes bodiliness. “Human beings are physical beings sharing a world with other physical beings.”
Human bodiliness is, in turn, intrinsically connected with human sexual differentiation. Just as every human person necessarily has a body, so also human bodies, like those of other mammals, are sexually differentiated as male or female: “Male and female he created them” (Gen 1:27).8 Saint John Paul II reminded us that, in the Book of Genesis, we learn that “Man is created ‘from the very beginning’ as male and female: the life of all humanity—whether of small communities or of society as a whole—is marked by this primordial duality.”9 The Catechism of the Catholic Church affirms: “Man and woman have been created, which is to say, willed by God: on the one hand, in perfect equality as human persons; on the other, in their respective beings as man and woman. ‘Being man’ or ‘being woman’ is a reality which is good and willed by God.”
So Catholic theology, as I understand regards it as impossible for the soul to be in the wrong body because body and soul develop together, are one thing, not separate, and will be resurrected together on judgement day.