No, I realy think so! They have the same voice actors and they look alike... Then what was the reason to kill Kaji??? So that no one would see the resemblance between them!
(and nobody knew that Kaworu is an angel+clone or somethin' untill he reached the final layer and allmost caused the 3rd Impact)
I know it sounds strange, but try to look at the smile of Kaworu or Kaji.
Weird... seams that it's the same smile...
