I guess so... though it wouldn't be impossibleI'm not sure they would use two different voice providers for two different banks in the same language. It's not like Tianyi's original VP can't record another bank in a different tone.
I think it's much more likely that they just had her original VP record both banks, and then used Kano's recordings sparingly to lessen the accent in them while still keeping the voice "Tianyi" -- she does sound very natural.
But I am just glad tianyi japanese finally sees a release date!