The Dutch Carribean (Suriname and some relatively small islands in the Antilles), not the Dutch Pacific. As for the reasoning behind the conflict, Denmark still has it's territory in the Caribbean (now the US Virgin Islands IRL) as the divergence of PoW in history happened before the Danes sold the Danish West Indies to the United States, and I wasn't planning on having them sold in this alternate timeline. As a result, relatively soon after the end of the Great War, with many of Europe's powers focussed on recuperating and rebuilding rather than protecting smaller nations and their colonial empires, Denmark would have declared war on the Netherlands to 'protect Danish interests in the West Indies and bring stability to the region'. Basically, the government would have declared that Dutch ships had entered Danish waters (in the West Indies) multiple times (a claim which was mostly unfounded and overexaggerated by the government for political and casus belli means) and that Suriname was experiencing political turmoil as a result of the onset of the Great Depression and the world-wide separatist/independence movements of the era in regards to colonies. Truthfully, they just wanted the revenue from the rubber, bauxite, gold and tourism of the area.

It's not really a big deal, and I could certainly do without Suriname and a few islands if necessary, but I don't see this as too much of a canon or logic-breaking action.