Hi @MAHANK,
If the Repos are not an option for you at the moment, you can use Visual Studio Code to compare 2 files.
It's pretty straightforward. All you have to do after installing VS Code is to download both files to your local environment, open them in the IDE, and follow instructions in the link below.
The disadvantage is, that the Notebooks might not be that easy to read if you have magic commands inside. But it's manageable though.
Read more here: https://code.visualstudio.com/docs/editor/codebasics#_compare-files