Sedlak & Sedlak Salary Surveys in Poland

Hi

Does anyone have any experience of working with the Sedlak & Seldak Salary surveys in Poland, in particular the manufacturing survey? Do you have a translation from the levels used in their surveys to other survey providers, WTW, Mercer or Korn Ferry, and are willing to share this information?

Any other information willing to be shared is gratefully received!

Kind regards

Sharon