Is there an issue with this file?
When I slice the non split version in PrusaSlicer, and set the colour changes as in the documentation, the result looks fine but when I do the same on the split version the dial face shows as all black (the colour I have set for the numerals) as the first layer AFTER the colour change appears to be still the top layer of the face section - so is filled in. It is as if the numerals section is one layer thinner on the stl for the split version and the bit below one thicker?
The jpeg attached shows both parts on the build plate after slicing and hopefully shows what I mean.
You are correct. The thicknesses are slightly different, even though they are functionally identical. The split dial needs a color change one layer higher at 13.0mm instead of 12.8mm.