If these are stock ringtones chances are you can't access them unless you're rooted. If they're not stock (or if the manufacturer made them available) they should be on an easily accessible folder named "Ringtones" and/or "Notifications".
Now, if they are stock and to save you the hassle of rooting one phone just to extract the ringtones, you could download 1">[click here on the second phone and just search/download the first phone's ringtone by name. Chances are someone else has already extracted it and uploaded it to the service. I've been able to find all ringtones I've searched so far... Granted, I haven't searched for a lot hehe but from BlackBerry's to Samsung's (Top dzwonki), there's a pretty good chance they're already there.