I can only confirm that. While importing the scapple OPML gives you the text of the different nodes, the order seems to be based on the position on the screen but not on the links one made. Starting from scratch sounds like the better idea.
How is this helpful? Well, it shows you the anagrams of scapple scrambled in different ways and helps you recognize the set of letters more easily. It will help you the next time these letters, S C A P P L E come up in a word scramble game.