Question --
does "one kit" mean you can't kitbash?
Revell's early Tiger I is the REALLY early one, with the pistol port on the turret side. Revell's later Tiger I has, of course, the late cupola. So if you want to do the mainstream 43 and early 44 Tiger I, during the prime of the vehicle's life (with the early cuploa but with the escape hatch instead of the pistol port on the turret side), you have to use the early kit but the turret sides from the later kit.
It wouldn't be the end of the world, as I could do a Tunisia (or Leningrad) Tiger I, but what I had in mind was a Kursk Tiger, and the Revell kits are no good for that.