Didnt an imax preservation get released in the last few years? how would this one compare to that?
Different thing. The IMAX preservation reintegrated some IMAX scenes into the movie in the normal aspect ratio instead of cropped in the top and bottom like in the official release. Those were sourced from Blu Ray extras and a fullscreen DVD.
This here would be a scan of a 35mm print as it was seen in cinemas back then, so you would get all the theatrical colors, grain etc.