I contacted them via their website form. I asked for Status Match from Miles & More Senator or Krisflyer PPS to Finnair Plus Gold but it was declined with the following (rude) answer. Surely I can send proof but I did not via this first contact. Dear Christoph, thank you for your e-mail. Unfortunately we have no status match. You may earn the points from Basic-level. Have a nice day. Best wishes Finnair Plc Finnair Customer Care