Oh… I just watched the jpn voice of TS demo.
Agumon voice isn't voiced by Chika, and the same goes for Patamon.
Demidevimon, Patamon, and Agumon have the exact same voice when they use their signature move.
Wormmon, Kyubimon and Mineveramon have the exact same voice when using their signature move.
Greymon has a manly voice, not the chika version. Greymon and Devimon have the exact same voice.
Pic is Aegiomon using the Attract Echo ability that is able to provoke and increase evasion rate onto Aegiomon.