YugaByte product manager here -- have documented the answer to your question [1] As you can see, there are many similarities but there are also a few important differences such as depth of PostgreSQL compatibility (YB reuses PostgreSQL query layer while CRDB is a re-implementation) and latency/throughput observed for modern OLTP workloads.

[1] https://docs.yugabyte.com/latest/comparisons/cockroachdb/