I think they should be paid the same, compare living in Germany vs a poorest country, yes your cost of living would be cheaper in the poorest country but also y

I think they should be paid the same, compare living in Germany vs a poorest country, yes your cost of living would be cheaper in the poorest country but also your quality of life in terms of infrastructures and public services, perhaps depending on the country access to health might be harder too, getting a top education, finding mentors... etc. There are two scenarios, the company offers you relocation or not, if the they don't then you should be paid the same as people located in the the richest country. I think is fair to be paid for the quality and value of your job regardless where you happen to live (at your own will or not).