Cost of living in Orsk (Russia) is 26% 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 198 prices entered by 17 different people.
For example, you would need at least 9,834 zł (руб 172,473) in Orsk to maintain the same standard of living that you can have with 7,800 zł in Łódź.