In episodes 23 and 24 of Jujutsu Kaisen, we find out that one of the fingers of Ryomen Sukuna has been hiding its presence at Yasohachi Bridge since many years, and has only become active since Itadori Yuuji first consumed a finger a few months prior. In these two episodes, Fushiguro Megumi is forced to confront a special grade cursed spirit that manifested from the cursed energy of Sukuna's finger at Yasohachi Bridge.
What confuses me is that this special grade cursed spirit has the same appearance and personality as the one that metamorphosed from the curse womb at the juvenile detention center, which Yuuji, Megumi and Kugisaki Nobara investigated in episodes 4 and 5. A finger of Sukuna was responsible for manifesting that special grade cursed spirit, too.
Question: Is it the case that any cursed spirit that a finger of Sukuna brings into manifestation will have the same form? If not, how did the cursed spirits at the juvenile detention center and Yasohachi Bridge appear so similar (one might even say identical)?