There are other similarities, more specifically some aspects of their posting style that I won't reveal here, besides misspellings, which makes to believe that it's not a coincidence and that both accounts are most likely controlled by the same person. Anyway, good find!

Since introduction of merit system it has never been easier to rank up alt accounts, which is a combination of an increased amount of merit and a decreased amount of posts. What you found is probably just a tip of the iceber. given the drastic increase in the number of active members in certain local boards.