Yes - I looked at Hockney's work a while ago (see my blog for the post I wrote
reflecting on a book by Hockney). I think the essence of what he has done is different from a traditional panorama shot.
The panorama is about extending the viewpoint from one point so that it freezes a moment in time as far (or further) than the naked eye can see. Hockney's pictures are not taken from a fixed viewpoint but use the medium of photography to explore time and space. For example, you might take pictures of the famous twisted spire of (?)St Mary's, Chesterfield and blend them together so you see one side lit by warm sunrise and the other by golden sunset; another approach would be to use pictures from different positions to emphasise the twist of the spire.
Wulf