Are the Uplink and Downlink Rates of an Inter-Region Bandwidth the Same?

Yes.

If you purchase a 10 Mbit/s bandwidth package for communication between the Chinese mainland and Asia Pacific and assign 5 Mbit/s of bandwidth between the CN East-Shanghai region and the CN-Hong Kong region, the maximum bandwidth from the CN East-Shanghai region to the CN-Hong Kong region and from the CN-Hong Kong region to the CN East-Shanghai region is 5 Mbit/s.