There is no given reason for the changes, but it could be due to meeting CERO A standards that have changed since the original 2004 release. Some of the costumes/outfits have been changed from the PS2 version.This was the same case for Dragon Quest VII on 3DS. There is no certain reason why this is the case, but it likely has to do with complicated restrictions on licensing and royalties. The musical score will not be fully orchestrated like the English PS2 version or Japanese 3DS version.
Firstly, Jessica's English VA has been changed - likely due to new recording required for additional scenes, and Jessica's original voice has long been retired from acting.
