Sorry for taking down the original enthousiasm...
It is twice the same loop.
It still remains one of the nicest marathons I've been biking (mainly the singletracks and lakeviews of the area). If you are Sweden it's worth the crossing to Turku or Hanko (from here it's a 5 hour drive NE to the lake district round Kuopio) coming from Belgium however it might turn out rather expensive for only 1 marathon (boat from Rostock to Hanko is 24h). By airplane it'll be round 400€ min to fly to Kuopio and then you are still not in Tahkovuori (1 hour by car).
I'll be focusing on the Transalp in July next year so in anyway no trip to Suomi for me.