Attached Link: Freewarehome: File Difference Analysis

It seems what blood is looking for is a file difference type function that would compare one CR2 [donor] to another CR2 [recipient] for differences and give the option to "copy" certain differences from the donor to the recipient? There are a quite a few utilities that will compare two files and highlight the differences and, on some, synchronize the two files. I wonder if you can rename a CR2 to TXT, use the utility, and rename the file back to a CR2? Perhaps, some of these utilities would be able to read the CR2s as is without the renaming? BTW, I did a Google search for "file difference utility" (without quotes) to find the supplied link. There were quite a few hits, but of the first few, this looked promising.