What should change in the language/voice with the same iGO APK version (9.35.xxx), unless there are different settings/variables/values ​​in the SYS.txt file 🙄🤔

The TTS engine is always the same, since it's system-dependent.
For example, I have the same skin from the same skinner on all 64-bit versions, so the conditions are the same.

In my opinion, the error isn't with iGO, but rather with your system environment 🤔🤔