Cost of living in Aveiro (Portugal) is 14% cheaper than in Zaragoza (Spain)
This comparison has some inconsistent or sparse data. It already provides a reliable comparison but it is not bullet-proof. It is based on 266 prices entered by 24 different people.
For example, to keep the same standard of living that would require €2,600 in Zaragoza you would need to make just about €2,235 in Aveiro.