Git compare file changes after merge

I just merged the changes from another branch to my branch and there is a problem for the application. How can I compare the changes of certain files before and after the merge? Thanks!

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Not sure  I understand your question:

you wan to know which files lines of a merged verson came from the other branch(es)?

1.) Identify the commit id of the merge and the commit id of your parent version.

1.a) by command line
git log  (or alternatively git log --graph to visualize the merge tree)
identify the commit, that performed the merge.

The first to lines will look something like
commit 3a12c325b1425ea260c6b4cb1f
Merge: 8732954 551673b

In this example either commit 8732954 or commit 551673b will be your most recent commit before the merge.
If in doubt use git log 8732954 or git log 551673b tio determine your past commit before merge.

In my example it was commit 8732954

1.b) with gitk

- start gitk and search for the commit id of the merge.
- click on it
- in the bottom left section of the gitk window you should see a list
of 'Parent:' commits.
In my case the red Parent commit was mine.

2.) list all affected filed

Now you can use for example
git diff --numstat 551673b 3a12c325b1425ea260c6b4cb1f
to list all affected files.

and then to list only the diffs for a given fie
git diff 551673b 3a12c325b1425ea260c6b4cb1f filename

Hope this helps.

Please explain your question in more detail if I misunderstood it

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