[Dennisa]

Sugar,

The two hands are different animals.

First hand you have a very high spr heads up with your AA. Its over 9. Bet the flop more, check the turn for pot control. Call reasonable bet on the river since you may of induced a bluff.

2nd hand you are the magical SPR of 4 with AA on the flop. Only think you should be thinking here is how do I get it all in by the river. KK is not as likely as villain would of probably 4 bet you. QQ is a possibility, but for the most part unless he is an ultra nit, coolers will just happen. Easy call on villains all in on the turn.
The hand plays out far easier with the optimal SPR.