I use regsnap (Or maybe snapshoot - I will check at home.) It both dumps snapshots plus does the compare & generates a reg file containing the extact differences. Unfortunately, there have been several programs with this name. Also, while I downloaded it orginally from nonags as freeware, the authors have since changed it to commercial ware I think.

Since, I downloaded it as freeware, I would think I could send you a copy of my version. Unfortunately, I have it at home. Send me your e-mail address I will try to dig out my version for you.
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Jack