Cost of living in Kigali (Rwanda) is 8% 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 701 prices entered by 93 different people.
For example, to keep the same standard of living that would require 83,000 Birr in Addis Ababa you would need to make just about 76,228 Birr (2,357,589 Franc) in Kigali.