def METHOD_NAME(self, concatted_file):
    """Check if the file has been changed."""
    if self.force_compress:
        return True
    tmp_concatted = '%s.tmp' % concatted_file
    file_exists = os.path.exists(concatted_file) and os.path.getsize(
        concatted_file
    ) == os.path.getsize(tmp_concatted)
    if file_exists:
        orig_hash = self._file_hash(concatted_file)
        temp_hash = self._file_hash(tmp_concatted)
        return orig_hash != temp_hash
    return True  # Different filesize, so it was definitely changed