Another one for the collection, but spotted in an issue of Your Commodore was a preview of Pitfighter with a slight difference in the game area.
The difference is merely the inclusion of a yellow trousered main character for Kato (who in the final game is either blue or red).
Here is a shot from the released game to compare:
I must admit I don’t think I ever played this on the Commodore 64 but I remember playing pitfighter in the arcades. I thought it was great with its digitized graphics and all.