Cost of living in Orsk (Russia) is 30% 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 200 prices entered by 19 different people.
For example, you would need at least 9,487 zł (руб 169,243) in Orsk to maintain the same standard of living that you can have with 7,300 zł in Łódź.