Abraxas and Socoth fit just fine with the two other books, but each of the three has a different and conflicting take on Nocticula.
The book of fiends describe her as a tutelary patron of women and of earthly communion through sex and hallucinogens, served by half-plant half-succubi half-giant-leech demons called alrunes (it also points that she envies the title of "witch queen" claimed by an archdevil, but the rest of the article don't associate her directly with witches); the fiendish codex gives this role to a unique shapechanging tree (not sure where this comes from) called Alrunes and concerns her with night; and the pathfinder book stapples her name (along with the dominion over assassins and whores) on Malcanthet's throne.
There's also the problem of pathfinder's Nocticula having dominion on darkness and shadow demons, when these are the domain of Rhyxali, Grazz't sister in previous D&D products, which is supposed to have no enemy among the other lords. I guess she could have been killed still, but I rather like her...
I would solve the confusion by following the FC1 on Alrunes' concerns about sisterhood the protection of women and add the Book of fiends's characterization of Nocticula (concerns for women, fey, nature and drugs, initiatic practices centered on the association of all of those, plus the service of avenging and castrating demons), keeping Malcanthet as the queen of succubi whose main concern is




ing (with) the other lords and princes, and making Nocticula a queen of night and of witches, whores, assassins and whoever else relies on night's cover to pursue their clandestine activities, as a mix of what's left of the three versions.
But adapting potential future pathfinder products where the queen of succubi is also queen of darkness and assassins into this would be difficult if these titles matter in the story. And I do hope for a high-level adventure path in the Abyss.