I do pack differently because we do different things. In terms of the theme park stuff, the same. Except I make SURE to have at least 2 pairs of tennis shoes and a good water ride pair of shoes.
The reason I pack differently is because most nights we tend to go out to eat after the parks. I don't waste those last precious hours inside Universal eating. We go back to the hotel and shower/get dressed for a nice meal at City Walk. At Disney it's not convenient to do this so we don't. We also don't do a whole lot of sit down places at disney.
I also like to pack a few light jackets for walking around the hotel, and some comfortable decent clothes for venturing out in the hotel at night.
But, some of you may do all that at disney. I don't since I stay off site. It's honestly easier for me to pack for universal for whatever reason.