Yes, you may be moved to a different contract:
“Pilots are threatened with losing their jobs if they did not move to OSM”
http://www.dn.no/nyheter/naringsliv/...uttert-til-osm
“In order to force pilots into signing the new contracts, the company introduced aggressive tactics by establishing a deadline at short notice”
“Pilots received written threats of contract termination if they chose not to comply with the imposed deadline”
http://www.sepla.es/en/sala-de-prens...ian-en-espana/