I have seen both edits.
They are only as similer as the source itself will allow it to be. As afar as reinserting footage and such.
The dark knight edition "remixes" the entire film. It's a much different film.
Don't get your hopes up on seeing the dark knight edition anytime soon.
Just so everyone knows, I'm DrakeRetro/Scissorpuppy. I am the one who first posted the news on the fan edit boards.
Before anyone say anything about " You said you would never come back to SHH" Yes I did say that, but I wanted to post on this topic to make sure everyone knows that the dark knight edition is not the same as any other
edit.
A professional editor in hollywood worked on this edit for over 2 years. It was edited on a high end editing system. I was at the "party" where it was first shown. 10 copies were given out, but I don't think this edit was ever inteneded to go beyond them. I have tried very hard to get a copy, but I haven't had any luck. That was almost 6 months ago when i saw it.
Chances are if someone claims to have this edit, they are A lying B have a different edit that they think is this one or C hussling you.
I think since most of the people involved in the edit work in hollywood, they'd rather not release it and keep it to themselves. For fear of some sort of "blacklisting". I can say that next to the rumored pending schmacher edit, this is the best version of BF ever. And fits very much with the first two films.
If you have seen any of the superman part 2 footage on Youtube that "saloman" is doing ( I think that is his name ) you'll get an idea of the quality put into the Dark knight edit. Hopefully one day fans will be able to see this great edit.