Would something like this work instead, rather than reinvent the wheel?
diff -qrs ~/bin/FilesDvorak/ ~/.PAST_RC_files/ | grep -P "are identical|differ"
You can play around with the grep to get the files present only in one of the dirs, etc.
diff
- -q --brief Output only whether files differ.
- -r --recursive Recursively compare any subdirectories found.
- -s --report-identical-files Report when two files are the same.
grep
- -P: Perl style regex. You can probably do away just fine without it though, I usually add it automatically.