Structurally they are similar enough that we can communicate. The discovery would be altering our science, but every attempt to exchange beyond technicalities and niceties is somehow incredibly boring to both sides.
After the initial awe, it would be like, yeah, we know aliens.
Newness is always exciting, but ongoing friendship requires common ground.
Nah you can just rely on a revolving door of new shiny interests and peer pressure your friends into picking up the fad too… because that’s healthy