Well, perhaps not nothing like her, but enough that it is blatantly obvious that Lariska is not a Vortixx.
Evidence is present in "Birth of a Dark Hunter," the short story featured at the end of the first BIONICLE encyclopedia. For people who never bought the BIONICLE encyclopedia, have lost theirs, or were intelligent enough to wait for a later edition, the story can be found here. Of course, there is one paragraph that serves as the least debatable evidence.
Nidhiki didn’t move. He had found out the newcomer’s name was Roodaka, but precious little else about her. Still, he could make a few educated guesses and the best way to confirm them was face-to-face. If you can call what she’s got a "face", he noted.
Clearly, unless Vortixx have radically differing facial structures (which while not impossible is almost never featured on Vortixx/Xian MOCs of Lariska), this striking difference from the faces to which a Toa would be accustomed, i.e, those of Matoran and Toa, is not present in Lariska, or at least not in the same way.
Of course, certain similarities are reasonable and often even necessary for the making of a convincing Lariska MOC. For instance, dark colors are well-suited to a stealthy character such as Lariska, no matter how often I have been tempted in the past to resort to the use of white as a component of her color scheme. Likewise, piece choice can be similar, as I'd like to think people agree in that it is always a plus in an MOC to ascribe to the norms of part choice of sets in the time period of the character in many situations, though of course 2006 parts might do just as well based on her later appearance in BIONICLE Legends 4.
I hope this succeeds in at least lessening the Roodaka-Lariska similarities I see far too often in MOCs. Note that this is not specifically targeted at your MOC, SZ, though it was yours with its more reasonable similarities such as color scheme and basic piece choice that reminded me of the need to make such an entry as this one.