is there an 35mm version of all the 3 movies extended edition?
Only FOTR extended has a 35mm scan so far.
In theory it’s possible that someone will find a TTT extended print and have it scanned.
In theory it’s NOT possible that someone will find a ROTK extended print and have it scanned, as 35mm prints were never created in the first place.
Note, I have no personal knowledge about this stuff, I’m just repeating what I’ve read from others since these scans had become available.