Both versions are textually identical, except for the ReadMe and the second version having a directory CHANGE_LISTS with some change summaries that is missing in the first version (verified with diff). The second version uses OS9/MAC newline conventions (0x0d), the first one is straight UNIX (0x0a).
When compared to the paper original these files are a poor substitute, but the information is all there except that most ASCII art images are somewhat mangled and a few non-ASCII images are missing. I have not done an extensive comparison.
Although a PDF version exists (at least that's what the licensing office claims to be selling) I've never seen it.
NB. Chapter IX on the Full Motion Video extension is missing from both versions :-(