Star Trek is a show filled with tropes, concepts, and ideas that are reused every single time. There's always the "leader" character, be it a captain or the head of the lower decks. There's always a "Spock" character; the one who doesn't emit emotions normally. There's always the science one, the pilot, the comedic relief, etc.
Just because a character fills a whole in the playbook that is Star Trek, doesn't mean they are alike. Which is what we're touching on today. Screenrant published an article where they compare Seven of Nine to T'Lyn. A rather out-there comparison, but it was made worse by saying that T'Llyn is the "new" Seven of Nine.
Which is a weird thing to say. As Seven of Nine was always Seven of Nine and until this very day, I always thought T'Lyn was T'Lyn.
The author essentially boils down the comparisons to two things, they're both lacking emotion and both came onto their shows in season four. That's not really a lot to build the case for "T'Lyn is the new Seven off Nine". Even more, that's not even true. T'Lyn was brought in during season two. She got a larger role, but she's not a starring character.
Seven of Nine came in at the start of season four as a replacement for Kes. The size of their roles are entirely different and the significance of their roles isn't comparable. T'Lyn is a fan-favorite secondary character who is getting some love. Seven of Nine single-handedly rejuvenated interest in the Voyager brand.
They aren't close to the same in that regard. More importantly, the writer says both characters are "finding themselves", yet Seven of Nine didn't need to find herself. She knew who she was, and she was good with that. What she needed was to heal from the trauma she endured. Her arch was about recovery both physically, emotionally, and mentally.
T'Lyn seems pretty well adjusted for a Vulcan. So again, not comparable.
Even their sense of humor seems to be different. T'Lyn is sarcastic in an understated way. Dare we say rude, at least by Vulcan standards. Seven of Nine, for the most part, is never trying to be funny. She rarely is and the few times she does something humorous, she is often trying to figure out the gag.
She's far more similar to Worf in that regard.
T'Lyn and Seven of Nine are great characters, but aside from both being women and neither big on emoting their feelings, they're as different as Jean-Luc Picard and a potato.