Well I suppose the tiger's wheel is not made by butter, so it's only the small gap between upper side armor and wheel have the 63mm weak spot. Yet now half of the side armor is coded 63mm...
But back in 2.2 cromwell still needs 3 side shot to kill a tiger and 6 pdr doesn't one shot KT, somehow the Dak tiger/tiger/KT's "HP" value got lower down in later version, made some really ridiculous kill possible, like the 2 mentioned above, or cromwell one shot tiger/crusader one shot Dak tiger by hitting the top armor.