This type of ultrasonic sensor is under patent for at least 8 years, and to my knowledge it is not Samsung that produces it but Qualcomm.

Then, return to see the dismantling of all iphones by Ifixit and returns list the found components which are not identified by Ifixit as components on the catalog of suppliers.There is much less than you think ...

This is true for the smartphones of other brands too, it is not exclusive, but this belief that all electronics in Apple products is designed according to its specifications is an illusion.