For those who don't know, 3DRealms launched a lot of games on steam, including Hocus Pocus (http://store.steampowered.com/app/358290/Hocus_Pocus/).
It is NOT a different version of the game though. It is NOT even a "more official" version. I actually bought it and is just a folder with DosBox, the Rom of Hocus Pocus and a cool .exe that sets up the game for you.
Cool thing about it: if you have problems setting up stuff like DosBox, this "version" does it for you... well, not absolutely because it has different source for the sound engine, and if you want the original sound you need to do a bunch of stuff to configurate it. It's still pretty speedrun friendly because it already had all the good set up for DosBox to emulate it at proper speed.
But yeah, I mostly wanted to say that they literally put a folder with DosBox and a rom and started selling that in Steam xd.