The guys ahead of us planned on the Duchess but it broke for a day, and they flew the Piper. The evaluator focused the ground eval accordingly, and other than a few V speeds, didn't ask them Piper specific questions (other that it being slightly better performing and fuel injected, there isn't much difference). One of them asked for, and received, a .8 practice ride in the Piper. Both passed their checkrides day 2. Due to the break, we flew our practice flights and checkrides on the same day. No issues there either. Caveat: I'm a prior MEI and my partner was a MC-12 guy, we weren't too worried. The two ahead of us were Viper/35 dudes. They were stressed...but we all walked out with equal ATPs.