Evan,
The reason the King Tiger is designated Ausf B is because the first Panzer VI was designated VK4502, the updated design that went into production was VK4503 (P) with the Porsche turret, and later it was replaced by the Henschel turret.
The Tiger I and the Tiger II are totally different designs, so that's why the letters don't have continuity.
And the Panther was designed before the King Tiger. The Panther first design was presented to Hitler on December 1942 while the order to design the King Tiger was not issued until January 1943.
dave
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