Lived in Germany for many years, had a husband who took the duvet with him when he turned. Result, one each, they were, are, I still have them, 2mx2m called french sized, solved the problem, also, I didn't need same weight, each to their own, mine was down his was silk. Worked well. Ok, Double laundry but marriage beds in Germany are effectively two single beds/mattresses, within a single frame. Each can be adjusted height wise, head or feet to your wish, and no rolling into the middle because mattress gone soft. Each has their own bed, individual taste and needs, slept very well. Married life great.