I've also gotten a little excited about fashion boots this fall, so I totally understand your pain! I bought several pairs and ended up returning most of them, since I feel like since this is my first time experimenting with nice boots, I don't yet know what I like and how I'm going to wear them. I kept a pair of knee-high black scrunch boots and a pair of short pink-red cowboy boots and I still have the Cleeos from Zappos in gray waiting to be decided on. I would recommend that you keep one of them for now, return the other one, and then keep track of how much you really want the other color. If it's as amazing as you think, and you keep thinking "darn it, I really wish I had this boot in brown", you can always buy it again in a month. On the other hand, you might find that you like the style less than you thought, or it's less comfortable than it feel now, and then you'll be glad you only have one pair.
They are super cute, though!