I did find the Disney+ download to be 4.54 GB, but audio track is identical to what Class316 posted (AAC 2.0 at 125kbps). That said, the Blu-ray is Dolby Digital 1.0 at 96kbps. Reminds me of their crappy Darby O’Gill audio track.
So you’re saying the Disney+ download has the same audiotrack as the DVD?