Both hylozism and panpsychism post-dated Thales. The former describes one of Aristotles doctrines and the latter is a 20th C doctrine.
We have far too little evidence to characterise him as either. Thales probably said and wrote a lot more about his philosophy that has come down to us.
Consider Judaism, Christianity and Islam. If we had as few fragments as Thales we would probably characterise them as the same religion. But of course they are theologically different despite the fact they are known as monotheisms. That some people do this, speciallyespecially when the evidence is scanty, is mainly because people like tidy characterisations.