The 8,8 cm Kwk 36 and the Kwk 43/Pak 43 guns were different guns, and used different, not interchangeable, ammunition. In fact...
The Kwk 36 was the gun used by the Tiger I tank, and had a 56 calibers long barrel. This model was derived from the famous 8,8 cm Flak 36/37 gun.
The Kwk 43 was the gun used by the King Tiger tank, and it had a 71 calibers long barrel. When mounted in an artillery carriage, this gun was designated PaK 43.
Because of its longer barrel and projectiles with bigger cartridge cases, the Kwk 43 was much more powerful that the Kwk 36 model, becuse it fired its projectiles to a higher velocity, which is a good thing if you want to pierce the enemy vehicles armor.
The numbers:
The Kwk 36 gun firing standard AP rounds (not fancy tungsten cored projectiles) could defeat 100 mm of armored plate inclined 30º from the vertical at 1000 m distance. In the same conditions, the Kwk 43 could defeat 165 mm of armored plate.
According to Yrfin´s tables, those numbers translate to HA values of 18 and 23, and translated to "my" table, those values would be 16 and 21... I think I will update my table with slightly higher values for the sake of commonality with Yrfin´s and the vanilla game equipment table values.
