I see this sometimes, too, and I'll be darned if I can see
what's different. Every so often I'll do a spot check and compare
files, just to make sure I'm not missing something. I wouldn't be
too concerned about this, but it's probably a good idea to check
every now and again to make sure that the files really are the
same. If you get the history for a file, you can easily compare two
versions using the file compare.
G