The Internet Oracle has pondered your question deeply.
Your question was:

> Oh, mighty Oracle, whose database exceeds that of the blasphemous Ellison,
> please search your relationships to find the answer to my tiny spec of an
> insignificant question: 
> 
> An examination of the API in several different micro-kernel based OS's has
> revealed to us some striking similarities.  Are all micro-kernel
> architectures essentially the same? 
> 
> 

And in response, thus spake the Oracle:

} Being omniscient, I know that you mistyped the acronyms and meant
} "AIIP" and "OR". That's okay. The answer is yes; as Act II Popcorn and
} Orville-Reddenbocher have demonstrated, micro-kernel architectures are
} essentially the same. You might as well purchase the generic store
} brands.
} 
}   You owe The Oracle some butter.