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I heard they're the same as the standard, just a different part number and they have a "added weight" for some reason. But people have done the manual to auto swap and reused the driveshaft.
I would take Hustler up on the auto driveshaft. I bought my 1.8 diff from him and he gave me that auto driveshaft ( Not knowing there was any difference) and it didn't work. I can't remember which one was shorter, and they have different splines too. Although I'm not sure what year car the driveshaft was out of.
If you want a bigger pic just ask, I'm too lazy right now.