How can I export changed files in SVN that have changed between two revisions. I need a solution either via command line or by using any scripts (with proper folder structure).
If I understand your question properly, you are not interested in a global patch between revisions. In this case, you need to export each revision in a separate directory, then use a tool like Beyond Compare (or anything equivalent like WinMerge) to identify modified files.
But, if your build directory is under version control, then you would be better off creating a patch and apply it on it.