|can Oregon grown Van and Bing cherries be grafted to native Pa cherry trees.|
|I believe it would be technically possible to do this, however it would be better to use a more similar cherry or closer related cherry as the rootstock. Usually, it is best to use two plants from the same genus and species.
According to the following University of Missouri Extension publication, "sour cherry is not a good understock for sweet cherry. Sweet cherry is more commonly grafted onto Mazzard (Prunus avium) or Mahaleb (P. mahaleb) seedlings." You may find some interesting pointers and tips in the article. You may need to cut and paste the complete url into your browser to make it work correctly.
Good luck with your project!