They're not the same artist. Go to their respective sites and see the very different style. It just seems like it because of post #132848. See http://omokaji.net/ on September 1st. What I can make out from the entry is that there was an Asakura Only event going on. k_hiro actually mentions and links to Tokyo there (as being another person).
Scroll down a few more entries and their very different style becomes more clear.
