A difference being whether Apple does or doesn't Apple still gets to maintain 1 version of their unrestricted browser either way whereas if Mozilla does or doesn't it either has to maintain 1 version of their unrestricted browser and 1 version of their restrictor browser or 1 version of their restricted browser.
I.e. your proposed situation is a bit of a "have your cake and eat it too" for Apple. A possibility sure, but not really an equivalent remark.