Cost of living in Kigali (Rwanda) is 26% cheaper than in Addis Ababa (Ethiopia)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 917 prices entered by 96 different people.
For example, to keep the same standard of living that would require 111,000 Birr in Addis Ababa you would need to make just about 82,102 Birr (2,558,387 Franc) in Kigali.