Nauticam zoom gears for Olympus 14-42 vs. 9-18

Hello all

What is the physical difference between Nauticam zoom gears for Olympus 14-42 and Olympus 9-18 lenses? I have zoom gear for 14-42, and just out of curiosity before ordering new gear I tested it on 9-18. I was able to mount it without using any excessive forces and it worked well in housing. Is there a reason I miss to have a specific gear for the 9-18?

Thanks L.

MZD 9-18 and 14-42 II have the same diameter 56.5mm , but old MZD 14-42 has 65.5mm. Your lens has to be 14-42 II