You can compare textblock tags in your report with a previous version of the same document to identify any changes between the two versions.
To start the comparison, open the Tagger and go to the Tool menu and select the option "Compare roll forwarded text mappings with external file…".
This will open a window where you will need to browse and select the mapping file you would like to compare to your current textblock tags.
You can download previous versions of mapping files from the "Earlier Versions" section in CtrlPrint, see this support article for more information.
A new window will open in the tagger where you can see the differences for each textblock tag highlighted. The Ratio column shows how much (on a scale of 0 to 1) the content of this particular tag has changed between versions where 1 means that the tag is exactly the same as in the previous version. The left side of the window is from the previous version and the right side is the current version that you have opened in the Tagger.
If you click on one of the tags, the text of the two different versions in the documents will appear in the bottom window section. The content that differs between the versions are highlighted to make the comparison clearer.