...I listened to it again but they still sound different to me.
The "Fayla" voice still has a different sound from the "non-'Fayla'" voice.

In fact, the difference in the way they talk seems even more pronounced to me than when they were at different tones.
The one who you're saying is Fayla's secret identity talks like she doesn't open her mouth as wide as "Fayla" (or something like that).

I still get that sense of some fundamental difference in the two voices.
Influction or not, I'm not entirely convinced that this is the same person.

Forgive me!