Keep in mind I am no expert on King's signature... but I do have some experience with identifying forged signatures (as a teacher, I get 'em all the time on tests and detention slips!) The first to me looks like a tracing job, based on the areas the ink seems to "pool" from a hesitating hand before moving on to the next letter. Also, the ink doesn't "thin" at the right places in the letters, indicating the pen was not held at a natural angle or moved at a natural speed. That first one to me seems fake for those reasons. (Especially that loop from the "n" that doesn't quite curve smoothly, suggesting that too was traced).
The second, I cannot say. The ink doesn't give anything away and I'm not familiar enough with the "real deal" to say it isn't legit.