LaTeX diff
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Download the old and new versions of the document from Overleaf
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Follow steps from here to flatten the multiple tex files into one.
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pip3 install latex_proj_tool -
python3 -m latex_proj_tool flat my_project/main.tex --output out.tex
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Produce a diff file
latexdiff old.tex new.tex > diff.tex -
Compile this diff file to produce a pdf