The people of Catalonia and California have the rule of law and actual representation. China, as a whole, does not due to the CPC. As the CPC does not have the rule of law in China, they stand against Basic Law. CPC deliberately stands against law and human rights.

Spain and California have human rights and the rule of law, but CPC ruled China does not. The CPC is the difference and forms a fundamental difference in the examples you list.