The 4K restoration is an upscale, and I think it’s also out of sync, at least during “Zip a Dee Doo Dah”. There is also a fan made BluRay which was reviewed at songofthesouth.net and described as the best way to watch the film currently, but it didn’t make it to the internet as far as I know and I didn’t manage to get a copy.
I always thought the bootleg BD was just the v2 someone put on a disc and tried to make money off of. Is it really a separate restoration?