A DAME would have to comment on whether there's differences in the standard of medical exam they give you for fixed vs. rotary, but my guess is that the form you fill in with the boxes ticked about what kind of flying you do probably gets entered straight into the computer at CASA, and it just spits out your medical form as per that.
I can't imagine there would be much difference in the required serviceability of your bodily systems for each kind of flying.