So... The Dutch player selling a colony is equal to the Swedish peace?
Fact: the Swedes giving up Finland is not reasonable, when their Ottoman and Austrian allies have 250,000 troops ready. I advise a reset in Scandinavia to before the surrender, so Sweden can do what it normally would: call on its Austrian and Ottoman allies.
Also of note: The Danish King also just attacked his brother-in-law, first cousin through George I, and cousin-in-law, Gustav III - a highly irregular move, as such marriage alliances made war almost impossible. Frederick II attacked his nephew, and Catherine the Great attacked her first cousin. Only by the late nineteenth and early twentieth century had warfare become so impersonal and royal marriages powerless enough for a war between first cousins to be considered not a major incident. The reputation of Denmark in particular would be hurt.
Not related to the current dispute, but it's not really accurate to say that royal marriages made war impossible. For example, Louis XIV's wife was the half-sister of the King of Spain, and yet that didn't stop his expansionist policies against the Spanish. And in the War of the Quadruple Alliance, the French and Spanish Bourbons fought each other even though they were members of the same dynasty.