In the Bushes

This is something that has confused me for quite some time. In a speech given on 27 January 1992, George H. W. Bush gives a speech in which he says "we need a nation closer to the Waltons than the Simpsons".The producers of The Simpsons rush out a response appended to a repeat of "Stark Raving Dad" a few days later, where the family watch the clip on their TV, to which Bart responds "hey, we're just like the Waltons. We're praying for an end to the depression, too".However, an alternative version of the clip exists, which uses footage of Bush at the 1992 Republican National Convention later that year, where he repeated the line (as "...to make American families a lot more like the Waltons and a lot less like the Simpsons".) This is most notably seen in documentaries such as the "Bush vs. Simpsons" featurette on the Season 3 DVD, but I was not sure of its origin.