Cost of living in Orsk (Russia) is 36% more expensive than in Łódź (Poland)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 96 prices entered by 15 different people.
For example, you would need at least 10,047 zł (руб 166,874) in Orsk to maintain the same standard of living that you can have with 7,400 zł in Łódź.