The Stand, and IT too, had a rerelease after King added a bunch of scenes that were originally cut by the editor. Sometime in the nineties I think anyway. No further changes were ever made later. I'm not sue you can even find the original versions anymore.
In addition to restoring lost content, King updated some references in The Stand (actor names, song titles, etc) to make it more contemporary. At least by early 1990 standards.
I realize this is old. This is me not caring.