Only Tomoko Kawakami re-recorded lines for the 2007 remaster of the series. It was commented on by the staff how surprised they were that she could still perform the role after so many years, but all we were ever told is that some changes were made to change the emotional weight of the story.
This is one such change. For context, Utena refers to Anthy as 'Himemiya' almost exclusively, so the use of her first name would be a considerable advance of intimacy for her. (Anthy calling her 'Utena' right at the end is so impactful for this reason.) They changed this probably to keep the building intimacy of their relationship more even, since this early in episode 20, "Wakaba Hath Flourished Verdantly," Utena wouldn't be quite this attached yet to her.

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