Is King any different from Alan Zemaitis? The scouting reports sound almost identical.
They're not really comparable at all. The issue with Zemaitis was that he was limited athletically. King on the other hand

ositives: Physically, has everything scouts are looking for. Tight skinned, athletic build, good size and rare straight-line speed. ... Smooth hip turn in transition to stick with receivers out of their breaks. ... Versatile athlete who has seen time at wide receiver. ... Shows the ability to pluck the ball out of the air. ... Flashes explosiveness as a hitter.
Negatives: Left out on an island in 2007 and really struggled down the stretch. ... Has the athleticism to run with any receiver in the country, but seemed to struggle with more refined route-runners. ... Too often seemed satisfied with breaking up passes when opportunities for interceptions were there. ... Finished 2007 with 15 passes broken up and only two interceptions. ... Not particularly aggressive or physical in run support.
Per NFL Draft Scout
I'm also not clear on who is overrating King? I'm seeing him project in the middle rounds.