I think it’s mostly about how good you connect with one another. Some twins are glued to the hip, dress the same, and act the same which can also be perceived as “telepathy”, while others don’t share those things.
My fiancé’s a twin, and I forget about it all the time because him and her have like no relationship whatsoever. They never hang out just the two of them, they barely even talk, for that fact. He even forgets that he’s a twin lol
Which is why I think it just depends on the people and their relationship together 