A quick post thanks to team member Grzegorz Antosiewicz, who has found a set of early Crazy Cars 3 screenshots in Generation 4 magazine from June 1991, which show a very different looking game overall to the one that was eventually released:
As you can see, the screenshots show different and bigger sprites for the cars, less detailed roads and a very early HUD.
Essentially a complete redesign occurred. It would be very interesting to see this early prototype in action and see just how much of a different direction the game was going in.
With thanks to Grzegorz Antosiewicz for highlighting and the scans provided.