Phalangeriformes /fəˈlændʒərɪfɔːrmiːz/ are quadrupedal marsupials with long tails. They are a paraphyletic[1] suborder of diprotodontia, consiting of about 70 species[clarification needed] of small to medium-sized marsupials native to Australia, New Guinea, and Sulawesi.[2] It includes possums,[3] gliders, and cuscus.
The words are fully synonymous in American English, and Australian possums are named after American possums.
Looks like he’s right about the Aussie ones being cuter, though.
https://en.wikipedia.org/wiki/Phalangeriformes
https://upload.wikimedia.org/wikipedia/commons/8/87/Phalangeriformes.jpg
Opossums (/əˈpɒsəmz/) are members of the marsupial order Didelphimorphia (/daɪˌdɛlfɪˈmɔːrfiə/) endemic to the Americas.
https://upload.wikimedia.org/wikipedia/commons/f/f8/Baby_opossum.jpg
EDIT: !opossums@lemmy.world has cute American opossums