Her voice in that clip does sound like the stereo version of Beru's voice, except with English accent. It's possible that the mono version could be her also, and just a different dub, but I can never really make up my mind what to think about that.

In the special edition (both '97 and '04 mixes), there is a strange audio dropout in the middle of her line "Luke's just not a farmer, Owen. He has too much of his father in him." The sound cuts out briefly just before the word 'father', even though it is the same take as in the older stereo mixes. I don't know whether this was due to a problem with the source recording, or if it was a cheap and clumsy attempt to accent the word 'father' for some reason; regardless, it sounds rather stupid and is an obvious error. The dropout is clearly visible in the waveform in addition to be being audible.