Does the iPad 3/4 charger use a standard C7/C8 interface?
I happen to have a C8 plug from my PS Vita charger, and my iPad (3rd gen) charger here.  I plugged them into each other, and plugged in my iPhone.  Sure enough, it started charging my phone.



So yes, this does work fine.  C8 plugs will plug into the iPad 3 chargers.