Package texlive-texdiff

Compares two (La)TeX documents to create a merged version showing changes

http://tug.org/texlive/

Texdiff compares two (La)TeX documents to create a merged version showing
changes, similar to that of 'Change Tracking' in some word processors.

General Commands
Command Description
texdiff Compares two (La)TeX documents to create a merged version showing changes...