No, Mel Brooks was just using the same technique as W. C. Fields and the Marx Brothers, who often ended their movies with a chase scene (e.g., The Bank Dick, The Big Store) because they had no other idea how to end it. Nothing about the ending of Blazing Saddles was a logical outgrowth of anything that happened before; it’s Brooks just giving up and throwing in the kitchen sink of gags.
The Pythons knew enough to set up the ending as the payoff of a clear subplot of the movie. Brooks did nothing to indicate that the film was anything but a western parody until he needed an ending; Python knew to break the illusion early on and use that for a payoff. It was based in story logic; Brooks’s ending was not.