A podcast called Straight Talk MD talks about several different weird transplants like this in this episode: https://pca.st/episode/1628074d-b415-477b-b1f6-81c9d81fc261 (For Fame or Money? The Dark Side of Ten Amazing Medical Firsts on Straight Talk MD)
Of note is the disastrous synthetic heart in the 90’s. I was surprised that such a thing was attempted.
They seem to have forgotten about this baboon-to-human heart transplant from 1984.
https://en.wikipedia.org/wiki/Baby_Fae