Its probably to give you a sense of relation between the two characters, a strong one. Just like how Akuma and Ryu share similar movesets as well as Ken which we come to know as the Shotos. Dan doesnt count

Its the same for Kyo and Iori with their flames. Terry was pretty original for me...i dont know why he was put up there. Only Rock has similar movesets to him.

If you didnt know (SPOILER) K is a clone of Kyo...the supposedly strongest figher on the Hero/Japan Team in which NESTS wanted to get in their hands...