The sim they use for the interview is just a very basic PCATD. Its not for evaluating your actual flying skills as much as it is for your instrument skills. They will give you a takeoff, departure procedure, track a few radials, maybe two or three hold entries, and an ILS. Make sure you are calling for and doing the checklists you would be with the airplane you are presently flying. If you do the interview prep, I believe you use the exact same sim they do for the interview.