>>3250543
Not sure, I'm not familiar with a lot of curses. To tell the truth, I'm not familiar with how Western/Eastern curses relate, even.
The way I thought, the hakutaku/were-hakutaku are one and the same, only confused by differing accounts and the millennia-long gaps in time between their appearances.
There is possibly only one hakutaku - not immortal, but imperishable. Upon the death of the previous hakutaku, its knowledge and possibly memories (along with transformation at full moon) are transferred to a suitable host, who may have been marked from birth.
Notable incarnations include The Sorcerer (stone age Europe), Bai Ze (China, legendary past), Cernunnos (pagan Europe) and most recently Keine.
... but as said, I'm just making this up. There is no canon explanation for ANYTHING involving the touhou hakutaku.