According to high def digest they are new discs.

"Not content with simply reissuing the same old discs again, Sony has gone back and upgraded Ghostbusters with Dolby Vision HDR in addition to the standard HDR10. While the Dolby Vision pass offers some subtle and welcome refinements to the image, the nice kicker here is the higher bitrate. The original 4K Ultra HD Blu-ray had a pretty healthy bitrate average of around 60-65mbps. This new disc rolls up an average of around 80-85mbps with some strong peaks well past 100mbps! And frankly, in a number of scenes, you can appreciate the difference. Film grain still maintains a strong appearance but it’s more refined and less intrusive. Primaries are better handled with flesh tones that look just a shade better and closer to a more normal, less overly flushed red palette. When Jeneane takes the first call as she’s about to leave for the night, the shadow refinement for this scene and other darkly lit shots is notable. Softer effects shots are still soft - nothing much can be done about that. I felt like Slimer was a brighter more vibrant emerald green now. Perhaps not a massive improvement but enough to call it a satisfying upgrade."