The aspect ratio is not the only difference between a panorama taken by moving the camera around and stitching a pano and a wide-angle shot cropped to 2:1. The projection is different. The stitched panorama will have a cylindrical projection, the wide angle shot a spherical projection. The cylindrical projection will look much more natural in an all-around projection on my Apple Vision pro than the cropped wide angle shot.
When I take a panoramic photo with my iPhone 15 Pro Max it will have an exif tag "Custom Rendered : Panorama", when I check with exiftool.
The images, that are just having a panoramic aspect ratio are not having this tag, not even the panoramas I have stitched with Panorama Maker or Luminar Neo.
On my Mac I have assigned a keyword "Panorama" to the photos, that have been taken as panoramas, so I can create a smart album with true panoramas. Unfortunately, this smart album is not available on my Apple Vision Pro, so I have to duplicate it as a standard album.