Ep. II would be more difficult, especially with no home video release of the original.
There were plenty of VCD and DVD bootlegs out there at the time that EP II was released and there was the Full Screen VHS of the film too.
Both would be a good reference as to what the theatrical version was like but wether or not DVD quality material existed for it all remains to be seen.
Is the 1080i HiDef version of EP II (currently going up on a.b.sw) the theatrical or DVD version??