Heilemann said:
Same poster as Style A, but in a different design. What's the deal? Easier/cheaper to print?
According to the Star Wars Poster Book, Lucasfilm felt that the Jung artwork was "too dark." You have some good info in this article:
http://posterwire.com/archives/2006/06/13/tim-hildebrandt/
What's also interesting is that both were treated with the same last minute touch-ups, (the droids) on the Jung artwork they were added by comic book artist Nick Cardy whereas on the Hildebrandt version it was done by themselfs. The same thing happened on Jung's half-sheet art.