In the video below (courtesy of Simaia), you can listen to voice comparisons between pre and post 9.1 Kael'thas lines.
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The first build of Patch 9.1, Chains of Domination, is currently available to test in the Public Test Realm. Players have been exploring undocumented changes, but a specific change in 9.1 has caught the attention of players: All voice lines of Kael'thas Sunstrider have been re-recorded by a different voice actor.