Well, I have finally completed my almost-proof that the Australian Blu-ray version of The Fifth Element has identical video to the US remastered version (see two posts down). To do this I extracted the first 999 ‘I’ frames from each version, saving them in *.png format with identical parameters. I then compared the resulting files, one from each of 999 matching pairs against the other one, using the DOS ‘fc /b’ command. In every case the result was ‘FC: no differences encountered’.
These 999 frames covered the first 738 seconds, or 12 minutes and 18 seconds of the movie, which took it up to the start of Chapter 3. It is possible, I suppose, that the 17 or so non-captured frames for every captured one may exhibit some differences, but it seems exceedingly unlikely.