Cost of living in Orsk (Russia) is 35% 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 156 prices entered by 16 different people.
For example, you would need at least 8,661 zł (руб 145,520) in Orsk to maintain the same standard of living that you can have with 6,400 zł in Łódź.