Hm, I'm pretty curious about your project.
You know that there are free online UUID generators on the internet ?
I used one to create new root templates in the time before the editor was released.
Haven't used the dialog editor myself and will not before a re-introduction to it with the tutorial video, but wouldn't it be safer to create a new dialog in the editor and copy&paste the existing dialog lines you need ?
Better safe than sorry if you are unsure. Using the editor should make sure you get uniques and don't have to worry about this.
If you have one and the same UUID for different texts in one file, then I would definitely expect problems. Should not risk that.
