According to Wookieepedia, the actress is the same, but it's unclear about which version uses which takes from what recording session.
British actress Shelagh Fraser was cast to play Aunt Beru in Star Wars. Fraser's first day of shooting was April 1, 1976; the shots of the Lars' charred skeletons were filmed a few days prior. When post-production on the film began, sound mixer Derek Ball traveled to Fraser's house and recorded additional dialogue.[9] In the mono soundmix of the first release of Star Wars, different takes for Beru's lines were used. All subsequent home video sound mixes use the same take that was used in the initial theatrical Dolby mixes.[10]
9. ↑ 9.0 9.1 The Making of Star Wars: The Definitive Story Behind the Original Film
10. ↑ The Original First-Week Engagements Of “Star Wars”. in70mm.com. Retrieved on August 22, 2013.
http://starwars.wikia.com/wiki/Beru_Whitesun_Lars