Hay un final americano en el que ella no muere. Y es el que yo recuerdo haber visto por primera vez, sería en los 90's.

http://www.imdb.com/title/tt0022879/alternateversions

Paramount decided, after much disagreement, to keep Hemingway's original ending and fade out after the death of Catherine Barkley. This ending was kept for the European release, but a new ending in which Barkley lives was later added to the U.S. release.