I don't really know, because I am only going by what I have seen. Usually, when she switches over to another ID, she tells people that it is her.
So, you could be right and you could be wrong. But, I'm really not sure. I only know of those two.
On another note- Tantrum was my fan(at the time when fans were recognized), as well, as Xtasis. She left no fan mail, which means she didn't leave a comment, when shes signed up to fan me.
However, I*N*V*I*C*T*U*S is also my fan/follower, but she did leave a comment on my fan mail.
So, I'll let you know, Tantrum/Xtasis also recently defanned me on both of those accounts, because of something I recently said, but I*N*V*I*C*T*U*S is still a fan/follower.
Again, I can not be sure. 