This free tool by Autosofted can allow you to compare two different text or doc files and will show you of the differences between those 2 files. The program will highlight the line that it detects the change on, and also display short messages that specifically inform you on which word(s) have changed. The program can perform the full comparison of both files and provide a small detailed report all in less than a minute.
Unlike other text comparing software, this tool requires no installation, it's free and it's incredibly simple to use. This program is also very tiny in size (less than 1 MB) so you won't lose much hard drive space on your PC.