Khorasan wheat, often known by one popular brand name thereof, KAMUT®, is an ancient grain that is related to modern-day wheat, but has a number of differences. Does it have the halachic status of wheat, e.g., with regard to chametz and suitability for matzah, or whether its berachah is hamotzi / mezonos?
Kamut is a variety of wheat which can become Chametz if mixed with water and left unattended for 18 minutes.
Like any fruit, wheat can have different varieties. Just because it is larger or slightly easier to digest does not make it something else other than wheat. It grows the same way, it is harvested much the same way, it is ground to flour, and it is used for bread. While it's conceivable that the 18-minute rule for Matzah might need to be adjusted because of the unique properties of this variety of wheat (although I'm not suggesting that this is the case; I'm just pointing out one possible ramification that could be discovered in using a "different" variety of a grain), the same can be said of baking Matzah in different climates, using different sources of water, etc. In other words, while some might think to add new stringencies to account for differences, that does not mean it is a different thing than is "traditionally" used.
Obviously, we're not going to find the word "khorasan" anywhere in the classic literature, so the best I can do for a proof that's based on sources more than 25 years old will have to utilize some indirect evidence.
I figure, if these two types of dagan (grain) aren't kilayim with each other:
than certainly these two aren't! I bet you can't even tell which of these is the khorasan wheat:
(pics from wikipedia)
I now assume that no non-dagan species can be non-kilayim with a dagan species. I have no proof to this, but I have no evidence of any counterexamples despite some time spent examining the kilayim possibilities of the different types of dagan in the Mishna cited above; additionally this principle seems very reasonable as I would think that their different statuses with regard to dagan would distinguish the two species enough to be different for the laws of kilayim as well.