Cost of living in Surabaya (Indonesia) is 18% cheaper than in Zhenjiang (China)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 170 prices entered by 16 different people.
For example, to keep the same standard of living that would require 元8,500 in Zhenjiang you would need to make just about 元7,004 (Rp 15,060,230) in Surabaya.