Just my personal 2c about eartips.
When it comes to uni iems, tip rolling is the most significant contributor of sound changes because it will control the seal and the insertion depth. Plus, the difference in material will affect absorption/reflection of the sound waves as it bounces between your eardrum and the tip of the nozzle inside your earcanal. Also, the bore opening can make a big difference as the sound funnels through into your earcanal. And so on.
It is also a very subjective experience since we have a different shape of the outer ear and the inner earcanal. I always include tip rolling section in every single of mine iem reviews, to share my experience and to raise awareness about what other eartips available out there.
But the fact still remains that people WILL hear it differently, not the same as the reviewer. So my personal advice is to build eartips collection and to try every pair of eartips you got with every new iem to hear the difference and to figure out which one gives YOU personally the best sound balance and fit comfort