You would have discovered the difference pretty quickly. The difference between 22mm and 3/4" would be quite noticeable.Wow. Multiple people on here have told me they interchange just one was smaller. Glad I didn’t use the FL910S yet then.
I've seen people mix up 3/4 and 18mm filters, a 3/4 will spin on an application requiring 18mm. Aside from a little extra play in the threads, most people don't even notice.