I believe it was Boris who first showed us that Crown Princess Victoria and Princess Madeleine sometimes switched portraits. Unfortunately I don't think his observations are in the archives.
For at least three years in the previous decade the sisters wore the portraits that had been worn by the other. However I haven't noticed this being done lately.
The frame with the more ornate bow with long tails and seven individually set diamonds, mostly worn by CP Victoria:
The frame with the less ornate bow and fourteen individually set diamonds, usually worn by Princess Madeleine: