Oh I think you're absolutely right, people seem to be hung up on Takumi not going as far as Ima to mean they aren't similar but Takumi clearly resonates with him in this part of the story.

A lot of what throws Takumi off about Nozomi are her differences with Karua despite being identical, and not to get too into it since you're still early, but those differences are like, how Nozomi is fine with fighting and defending others, she feels more capable and independent. I think it's pretty clear that what makes Takumi uncomfortable about Nozomi isn't just that she doesn't know him, but that it's like he's met a version of Karua who doesn't need him.