Hearts in Atlantis has as antagonists "low men in yellow suits." I can't remember if they make an appearance in the Dark Tower series, but I think they do. Anyway, Eyes of the Dragon seemed to me something that King wrote when he didn't want to finish DT; I just finished it today and it involves King Roland and Flagg.
SPOILERS AHEAD.
Also, in Eyes of the Dragon, it established Flagg as an ageless evil, which would certainly support this notion that he's the same bad guy in all of the books he's in.
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-Slauncha
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