I call bullshit on this. No version with those scenes was ever released. Because A. The effects are not finished on those scenes. B. No Music or foley work or adr exists only the location set dialogue.

People remember things being there that were not there or were from the comic book, novelization, story book, or radio drama.

A small clip of the unfinished scene with Biggs, Red Leader and Luke talking was shown in the making of star wars. This is the scene before they get in their individual X-wings to go off and attack the death star and red leader remembers Luke's Father a Jedi knight and not Darth Vader.