Open the original V4 cr2 in a good text editor (Textpad or Editpad lite).  Then open the saved, larger cr2 in the text editor.  Compare them.  Without actually seeing what's in the larger cr2, I can't even begin to guess what ended up there.

There are a couple of cr2 apps you can download.  Cr2 Builder and Cr2 editor.  One (I can't remember which off the top of my head) has a side by side comparison.  I highly recommend either D3D's Poser File editor or PhilC's Pz3 Editor (the lite version is free to try).  Both of them are designed to work specifically with Poser files.