comparing two ghost images then creating a file to update endpoint pc

Hi

we have ghost deploy solution 7.5 ( no additonal module like patch management)

I am looking to update deployed pc( multiple user per pc) with a few settiing, to various software ( ie, firefox , chrome.)

I try copying preference file, and registry setting, did not get any error, but still not the result i was hoping for.

I was curious  if there was something to compare the original image that was use to deploy to a new updated image and the difference be be put in a file to  deploy to the pc's

Thanks

Gilles