What is the source of that image?
You might use third party screenshots in forum to show your argument, but pages in numista catalogue require authorized image sources.
https://en.numista.com/info.php#picture_source_list_info
You could just create duplicate page of KM 290 (N#6607), change composition to silver, fix other details and see if referee approves it. Adding new page might be better as duplication copies year lines and it might cause problems.
Maybe referee will agree to put all patterns in one page. He accepted 2 duit patterns in one page. N#438397