Hypothesis from Fallacies, though some of her specifics are fact.
What follows is purely hypothesis:
Arcuied Brunestud possesses superstrength / superspeed and authority to request Marble Phantasm.
Comparatively, the Beauty of Yu / Akuta Hinako can request mana from the environment, and bears Authority over the Tree of Fusang. The mana that she collects to herself is used for the realization of Curses, vaguely akin to the Greater Grail of Fuyuki. Aside from perhaps the manifestation of different clothing, it's never directly confirmed that she has the capacity to request Marble Phantasm.
Moreover, even though she qualifies as a being of a Vampiric Breed, Hinako never exhibits the sort of bloodlust that Arc describes in Tsukihime.
All in all, there's not really that much overlap between Arcuied and Hinako.
Now, the Tree of Fusang is described as "an archive of data pertaining to every manner of life." Holmes believes that no tree, of the Age of the Gods or not, would be able to handle such a quantity of data; and so he hypothesizes that the Tree might have some sort of a subspace Dimension within it -- which Koyanskaya confirms. Then it's revealed that the Dimension within was of sufficient capacity to contain a Tree of Fantasy.
We never see the Tree of Fusang directly, but we're told that it's specifically biological in nature. Also, just in case it wasn't clear, the Tree of Fusang and the Tree of Fantasy aren't precisely the same existence. Where I'm going with this is -- "an archive of information pertaining to every manner of life." Doesn't that sound a lot like Moon Cell?
Then, might the Tree of Fusang by something akin to a Moontree Terminal?
What if the True Ancestors of the Universe of Grand Order were in reality descended from Moon Cell rather than Crimson Moon?
(As an aside, do recall that the human identity of "Akuta Hinako" isn't so much a disguise as a state of reduced performance, wherein she becomes susceptible to mortal injury by conventional means. At the time that she gorged herself on the blood of her Servant, she had in fact sustained mortal injury. However, we're told that even if she is killed, it's potentially possible that she could resurrect or be resurrected by means that wouldn't work with a human corpse. Arcuied, for reference, was able pull her own body back together after being cut up into 17 chunks of meat.)