Well, sure the actual PLOT outline is the same, but the details will be very different. There's only so much you can say in a list. I'll try to communicate my thoughts here as best I can.
I want there to be a new subplot with Luke having a recurring nightmare (the result of Vader attempting to get into his head), and I want his face to be scarred to hell from his last encounter. He'll, like I said, be an outcast from the group until the very end. Also, he has, again, used this time to train with Yoda, as you mention in the story. Luke's first scene should be him carrying out a successful version of the cave scene, to show growth.
The slaves I added because I realized that there was a humanity aspect missing if it were simply to be rebels vs empire. I figured they could be a mix of various humanoid races from various worlds, and could supply information to the alliance about interiors of various settlements. Also, the film needed some sort of pulse-pounder before the 3rd act.
I figured Lando would be feeling really bad about the events of the last movie, and constantly trying to regain trust from Han, who would be unreceptive to his attempts. Maybe just as simple as a role-reversal for the sail-barge battle, making it so that Lando saves Han. In any event, trust would be restored by the time the battle was underway, and Lando would get control of the Falcon for the air-strike. On 2 conditions. 1. Not even the tiniest of scratches. 2. Chewie must come with. Of course, he ends up breaking the first one.
Vader and the Emperor should be on more untrustworthy terms. Vader is constantly going against orders. And the Emperor is aware of his secret plan to upheave him and take power for himself. Luke merely provides a catalyst for both of them to take each other out.
I want the Death Star II not to be destroyed. 1. it's a change of pace. We've had the bunker scene before and it's too run of the mill for Star Wars. 2. It's a more effective and Jedi-like solution to end the fighting. Maybe it could be destroyed as soon as its passengers have been taken off, as more of a symbol of the Empire's dissolution than anything else.
Ben and Luke's final conversation should dwell more on the fact of Luke's history, leading to the revelation that his sister and he were seperated long ago. Luke shares a similar conversation with Han and Leia (Leia mentions something along the lines of "they're considering it" in regards to their participation in gov't) The film ends with Luke leaving the city planet (yes I will keep calling it that), credits. It's both a more conclusive and more open-ended ending, in classic Star Wars sense.
If anyone has any other suggestions for possible changes, please, let's combine a list of what we'd want to see.
BTW, you're not a heretic if you're just wanting to explore some other possibilities.