Try the following command:
$ git diff k73ud^..dj374
In order to make sure that all changes of k73ud are included in the resulting diff.
The command 'git diff' compares two endpoints (instead of a commit range).
As we wanted to see the changes introduced by k73ud, we need to notice the differences between the first parent commit of k73ud: k73ud^ (or k73ud^1 or k73ud~).
The results will include changes made since k73ud parent (meaning including changes from k73ud itself), instead of changes introduced since k73ud (up to dj374).
Alternatively, you can try:
$ git diff oldCommit..newCommit
$ git diff k73ud..dj374
and (1 space, not more):
$ git diff oldCommit newCommit
$ git diff k73ud dj374
If you want to retrieve only file names:
$ git diff k73ud dj374 --name-only
And you can get changes applied to another branch:
$ git diff k73ud dj374 > my.patch
$ git apply my.patch