I had assumed so. I was planning (in my mind) on having Russia defeated by Sweden but eventually defeated by Denmark and Prussia, with the death of Karl. I had also, in my thoughts, married Hedvig of Sweden and Fredrik IV of Denmark. Prussia in this case would gain quite a bit of land.
Is there any chance of Scandinavian unification under Karl XI of Sweden?
My other question is if there were any other PODS that would unify Scandinavia before the Seven Years War. Barring that, unification before the time of the OTL Napoleonic Wars.