If any forum members have used either Lotus or Chamonix film holders with their Korona 12x20 camera, could you please comment on compatibility in practice?

I know both the Lotus and Chamonix dimensions are slightly different from the original Korona holders, including T-distance, but I would very much value any accounts of first-hand experience using these particular holders with a Korona 12x20. Was the focal plane registration noticeably off? Did the holders move too much when inserted in the back? Were the results satisfactory?

Thank you in advance!