It won't be close. They've removed the gender ambiguity issue for starters as I mentioned in the last thread on this.
They'll probably have removed the double-edged aspect of the end; I'll bet it will be an overtly happy one lacking the extraordinary, beautiful darkness of Let the Right One In's ending.
Cayman's post:

love:love Going off on a bit of a tangent, just look at how *small* a difference can be important. You mentioned the DC of Blade Runner. Do you mean the 90s "so-called" DC, or Scott's own recent restoration? I liked the 90s version but I've come to realize it was really just because it felt like having an itch scratched: ah, good, finally can check off seeing the movie Scott wanted us to see (or so I thought).
I caught the more recent version a few weeks ago on a friend's big screen. I hadn't rushed to see it as I'd assumed the differences would be pretty minimal. And they are, I guess...but the restored version is so
smooth. The edits are so good and the experience is somehow just so much better...it's like watching the film for the first time without having sand and barbed wire in your underpants.
If subtle changes can do so much to affect one's viewing experience even on a familiar classic, then a wholesale remake of a beautiful, fragile film like LtROI would be a chancy proposition
even if they were going to do it shot-for-shot.