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I only have one data point for you, and it's not exactly the same as your situation:
I killed the transmission on my previous 1990 CRX Si. I had it replaced with one from a wrecker's, and they sent me the DX transmission by mistake. I never realized it until I started figuring my MPG and my RPMs/speed. My FE went up between 5% and 10% (and this was back in my "bad old days", driving 10 MPH over the posted limit) because the DX final drive is "taller" than the Si one. Even though the rest of the gears are the same.
I also realized that the acceleration in gear was noticeably slower, once I paid attention to it.
-soD
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