It was from the Disney Treasure MMC first week edition.
Walt saw the advent of color television and had reshot the cels created for the B&W MMC open in color (they were painted in color originally) ... I think when they were syndicated in the late 70s they originally used the color openings but then switched back to the B&W version later to keep the shows consistent with the B&W show content ...
IIRC it was actually shot that way. Shooting it in color was another bit of foresight on Walt's part that only proved to be so after his death when The New Mickey Mouse Club used it as their opening with a disco redo of the theme. Between them, you can also hear the difference between Cliff Edwards' Jiminy Cricket and Eddie Carroll's, as Edwards had died by that time.