These dubbed versions are typically distributed as ROM patches or pre-patched ISO files for PlayStation 1 emulators.
You can see examples of the Portuguese AI dubbing and full gameplay walkthroughs in the following videos: Castlevania_Symphony_of_the_Night_(BR)_(Dublado...
Many dubbed playthroughs are presented in 1080p at 60fps using emulators with graphical filters to modernize the appearance of the 2D sprites. These dubbed versions are typically distributed as ROM