They had the same woman doing all the voices in the French version as well. For beginning language learners, I think this could be a benefit as it cuts down on some distractions. Once they've grown accustomed to the one voice, they can focus on the words and animation. As they get better-versed in hearing and understanding the language, then it would be more important to ensure they're hearing a variety of voices, accents, etc. so that when they have the opportunity to practice in "real life," they can understand a variety of people.