The first time you launch svnX 2.0 it should automatically import your prefs, working copies & repositories from svnX 1.3.x (for the current user).
If necessary, you should be able to force svnX 2.0 to do this by quitting svnX 2.0, deleting ~/Library/Preferences/app.svnx.two.plist & ~/Library/Application Support/svnX/svnX Bookmarks and then relaunching svnX 2.0. Of course this will also delete all your svnX 2.0 prefs & bookmarks.
CHRIS