GPO for IE

All,

We have IE 8, 9 and we control them using GPO. 

Now we have started  IE 10, 11 for new machines. But OS is still Windows 7. And we will have all 4 versions of IE for some more time.

1. Do we need a new GPO for IE 10, 11 or can the existing one be used?

2.  IF we create a new GPO for IE 10, 11, do we migrate all settings from IE 8,9 ?

How can this be done and how can we manage IE 10, 11 on Windows 7 with RSAT tools?

Many Thanks!!!