In Denmark, they have Birthe Kjær and in Holland they have Corry Konings, there is nothing more to say about it.
Perhaps there is a difference, Birthe Kjær sing in Danish and Corry Konings singing in Dutch.
Corry Konings has recorded a lot of songs by Hans Bouwens, it has Birthe Kjær not, then there is a difference between Birthe Kjær and Corry Konings