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.
I literally cannot imagine that.
Even being boring would be fascinating. If their society was identical to ours it would be fascinating and we could learn from that. If all they did was watch TV all day, we could still learn from that.
We’d also want to study their DNA, their evolution, their planet.
What if it was a cognitive phenomena scp style where it’s like forced ADHD when interacting with the other species?
Wait, no… That’s still interesting