Two hands, live, just wondering if I made the correct plays

[Javanewt]

14 person tourney (11 left), six at my table, blinds are 75/150. EP raises all in with 1650. I have double his chips. I'm positive he has A high or a small pp. I'm CO. I have KK. Should I call?

A few orbits later, same player. Blinds are 100/200. Villain raises to 600. I'm sure that he does not have AA or KK. I have about 1600 chips left. I have AKs. Do I call or go all-in?