F&S system has a groove in the holder, which drops over a ridge in the back to form the light seal, Korona system has a ridge on the holder that engages a groove in the back to form the light seal. You can have the F&S back modified to take regular Korona type holder, which have a ridge on the holder. But you have to choose between the F&S type holders, or Korona type, as you can not use both types with the same back.
To get the best fit what you should do is send the back to RR, then have holders sent to him so he can get a perfect match between holder and back.
Sandy
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