I want to see the difference between old and new sources in git, but all files are displayed differently even though the contents are the same.

There is a web server that is left unattended without an administrator, but it is currently working properly. I would like to use git to see the difference between the contents (new source) and the previous source (old source) stored locally.

I tried to do this, but the contents are exactly the same, but they are displayed differently, so all the files are judged not to be the same.
It is true that the timestamps are all different, but it takes a lot of time and effort to see the difference between the contents.Is there any good way?

I am not good at command systems, so I use tortoise Git.