For sure Cobain knew "More Than a Feeling," so it would be surprising to me if he didn't notice the (admittedly fleeting) resemblance. "Teen Spirit" bears more of a resemblance to the Pixies than it does Boston, but it only barely sounds like Pixies, either.
they lampshaded the resemblance at reading '92
https://www.youtube.com/watch?v=R3XIGon2RjY
― Kate (rushomancy), Thursday, 16 November 2023 18:58 (five months ago) link