Well, intellectually, are you not curious as to what are the differences between those two games...as in, what the original game creators (same creators) though about in the first place, what they decided to keep and improve and how, etc. etc.
Though hey, I'm a -huge- HOMM fan (The biggest in the world, I checked.)... so if YOU aren't... I guess you don't -have- to be remarkably stupid, and well, a boring person.
(Another point that suddenly comes to mind as to why you should cheggout the game, is that its gameplay is different than HOMMs, and if you're interested in the remake, might as well glance at what its gameplay would more or less feel like.)