Being a brand new separate app, the PractiScore 2 does not import any previous data automatically. But you can decide what matches you want to bring over the new app (either using wifi sync or export). When matches are imported or synced the locally cached competitor info is updated as well.
You can also make a combined match from your past matches in the 1.x app and use it to bring in all your past competitors.
As an alternative, the “Export registration” option for a given match in the app will give you a csv file, which you can edit or clean up before importing.