Hi Bluebox55,
To answer your immediate question: NO - taking the GMAT with 'testing accomodations' will NOT put you in a situation in which you face a different/harder pool of Test questions. The idea that having additional time won't necessarily help someone to score higher is based around the fact that the GMAT is a big 'critical thinking test'; in simple terms, if you're not working in an organized, logical way, then a bit of extra time won't do much to compensate for weaknesses in those other areas.
1) Did you have accomodations when you took your first Official GMAT (and what were your Quant and Verbal Scaled Scores on that attempt)?
2) What is your Goal Score?
3) When are you planning to take your 2nd Official GMAT?
GMAT assassins aren't born, they're made,
Rich
Contact Rich at: [email protected]