I recently secured a 743B service manual from my friendly Bobcat dealer. The manual was shop used, so they provided a deep discount. I actually own a 743. (Long story, but the short version is that I was sold the unit as a "B" with the serial number plate missing. I actually found the serial number on the unit and determined it was not a "B"). My question: Is there a large difference in the manuals between the "B" and the 743? As always, thanks for the help.