Within those rules are a lot of things that can get by under them. Take two points in earths history bound by the same physical laws and life can look dramatically different. You can think of it like how we all use the same microsoft word but that doesn’t lead to the same exact book being written independently twice or more often. The amount of permutations to be taken along the way is a countless number probably far larger than the number of habitable star systems in the universe.

There's no reason to believe that because the physics are the same the biology will be the same. that's a big ungrounded assumption.