Thanks, still I was rather lazy to do anything with the old phone. I just made a copy via WinSPC from the squlite data from the X 10 I and have copied to the X10 III. And it works.
While I was there, I even copied data from Android apps, that I needed.
But I always realize in these cases thet SFOS is not for the average user. Just to find where app data (especially android) is can be a fun research by itself.