I was recently exploring a method to compare different versions of my thesis in latex. Interestingly, there is no simple way except joining all files in one .tex file and compare it with a similar file of older version. The files can be done joined in one .tex file using a python module, flattex which can be directly installed in using Git. BREAK

git clone [email protected]:johnjosephhorton/flatex.git
cd flatex
pip install –editable

Now, to compare the two versions of the thesis where main.tex is the file which keep the structure of all .tex files using /input method, flatex need to be ran first

flatex /path/to/V1/main.tex /path/to/V1/old.tex
flatex /path/to/V2/main.tex /path/to/V2/new.tex

Finally, we can use latexdiff to compare old version (old.tex) with new version (new.tex)

latexdiff /path/to/old.tex /path/to/new.tex > /path/to/diff.tex

Copy the graphics file related to newer version in the folder containing diff.tex and compile the latex file.