The holes in the dial are in the same locations for the 861 and 321. It's the same base movement really...
However the dials are not swapped without doing some work. The dial feet are different lengths and different diameters, so modifications would have to be made to make one work on another. The 321 uses a cam style screw accessed from the train side of the movement to hold the dial feet, while the 861 uses a small dial foot screw that is accessed on the edge of the movement.
In this photos the 321 dial is on the left, 861 on the right:
Cheers, Al
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