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It's all about how they're tuned.
The purpose of lowering the CR when turning up the boost is to prevent detonation. If you can tune the car to run 10 psi at 10:1 compression without detonation, it will run just as long as a motor running 10 psi at 8:1 compression, and be faster.
However, all things being equal, the engine running more psi is under more stress. So if both motors are well tuned (not detonating), motor B at 13 psi and 8.5:1 CR will not last as long as motor A at 10 psi and 10.0:1 CR.
FTL was on the right track, since running lean causes detonating because it raises the oxygen content. Other things that can cause detonation: advanced ignition timing, a high CR, and burred pistons, among others. Whatever the setup, know when to say when with boost, and make sure it's tuned to get the most out of the setup while maintaining the integrity of the motor.
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