title: Determining if two rar files are part of the same set
body: <p>Let's say I have two files, (name).<code>n</code>.rar and (name).<code>n+1</code>.rar, which appear to be part of the same set (same size, etc). Is there any easy way to tell if they're <em>actually</em> part of the same set, without first downloading the full set? Currently the only way I can tell is by downloading an instance of every file and and then seeing if WinRAR gives me an error when I try to unwrap them.</p>
  
  <p>(And on a related note, assuming there is such a method, can I do the same without having adjacent parts?)</p>
  
  <p>Ideally there's an existing program that can do this, but I can code my own if necessary.</p>
  
  <p>Further notes: These are two sets of archives of the same file. They appear identical to obvious checks: filenames are subsequent, contents are sane, sizes are identical, same number of parts. I then receive a full set of files. If they're not from the same set, I can't unrar them - though it seems that WinRAR will proceed to 100% before giving me the CRC error (file corrupt.)</p>