Maybe it's not her real name. Maybe it is. I don't know. But FetNoir is a relatively closed community, and GC isn't. I'm not sure she would want to be associated with this site at all, it could potentially cause embarrassment to her if friends and family stumbled across writings about her here.
Also, there are other users there who are quite open, even posting pictures of themselves. I may be writing about those girls too, and I think it's ethically more straightforward for me not to blur the lines between stuff on there, and stuff I post here. I'm sure there will be some stories that I'll publish on both forums, but not involving real girls.
I agree that I'm not doxxing or doing anything egregious like that, and I don't think I'm breaking any rules. But I had a nagging voice at the back of my mind, so this seems to be the easiest way for me to quell those doubts.