1: Yes
2: They are different cable lengths, but I think people have used them cross transmission use. I don't know this for sure. The shifter and base is a bit different, and the brackets are too but those match the transmission.
3: Just the length, it's like 3/4". It will work just fine, but take note if you are the type of person who likes launching the hell out of your car, you will have that much less engagement and can possibly strip out the spines. I know for a fact that a certain someone has street raced with over 500HP without stripping them, but add more HP and sticky drag track and that's beyond my knowledge.