That would be an interesting premise.
Dinosapiens
Suppose a race of intelligent dinosaurs evolved 65 million years ago, they build an industrialized society, and even traveled into space and then became extinct, and then 65 million years later another intelligent species rose to prominence, us. How might human history have gone differently if there was a vanished civilization 65 million years ago.
The first question is what would have caused the extinction of the dinosaurs? Would the Asteroid have been enough?
Second is, if that civilization was more advanced than our own, would we have been able to learn anything technologically useful from studying its artifacts?
What if there was a Dinosaur Moonbase, or a Dinosaur L5 O'Neill type colony, would they have survived 65 million years in some form?