Possible to sync passwords between (old) Safari and Firefox?

Is there a way to sync passwords between Safari (an older version I don’t use much) and Firefox on Catalina. The problem is that my iPhone, which is running 18.1.1., now has a Passwords app. However, many of those Web site passwords appear to be pulled from Safari and are either old and unused or have been updated on Firefox. But Safari doesn’t know that nor does the new Password app on iOS. Is there a way to sync them other than manually updating each one individually? (Also, many are for sites I haven’t visited for years and use an email address that no longer exists. They are unimportant, but many have been updated and are current under Firefox.) There are a lot of passwords to update!