I have seen mention of Rain Vodka, which I believe is 100% corn distillate, unaged.

Would this be the same as unaged corn whiskey (assuming for the moment that we can even call an un-oaked distillate whiskey)? The only differences that come to my mind might be the final still proof and the target flavor the distiller has in mind.

Of course, compared to - shall we say, portable distilleries of yesteryear - it seems the differences could be large, as triple distillation vs. thumper, column vs. pot still, and inefficiencies in the setup might yield any number of differences.