Where they not both the same game just with a different startup parameter to the shortcut? I can't remember now.
That was the case* with the "dev" server (aka "Training Room") -- I recall there was some folder differences so I made a .BAT file that did some necessary stuff for me... But Villains vs. Heroes? Unsure if when I re-download Heroes it will include BOTH games now, although I doubt it since the "both for the price of one!" deal is not for absolutely everyone playing one of them...
Guess I'll just have to try tonight or something, see if it gives me the option of grabbing both...
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*I think, IMHO, etc. etc. then again I may be completely clueless as to what you are talking about since I never had Villains installed (although I did play the beta/preview, and yes now that I think about it it WAS just a different parameter in the shortcut! (okay ignore some or most of what I have said here (and/or above))).