Cost of living in Monterrey (Mexico) is 12% cheaper than in Abuja (Nigeria)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 890 prices entered by 92 different people.
For example, to keep the same standard of living that would require 1,500,000 ₦ in Abuja you would need to make just about 1,316,394 ₦ (Mex$ 68,328) in Monterrey.