I can only go with the answer I get by from a
Google query
whom
/hoom/
Pronoun
Used instead of "who" as the object of a verb or preposition: "whom did he marry?".
Synonyms
who - which - whose - that
-----
And from the
entry at reference.com
Usage note
The typical usage guide statement about the choice between who and whom says that the choice must be determined by the grammar of the clause within which this pronoun occurs. Who is the appropriate form for the subject of a sentence or clause: Who are you? The voters who elected him have not been disappointed.
-----
Meh, more grammar things that are overly annoying.
IMHO, if it sounds good, run with it. They seem to be similar enough to me.
-J