Clutch questions

I am looking for a clutch. I want something aggresive.! I found one, but the description says it is "For SR20DET w/ KA24DE tranny". The SR20DET with SR20DET tranny is an extra $104 dollar option. I thought the KA and SR splines were the same and could be interchanged. Why is it more for the SR20DET tranny clutch.?? With the KA clutch work.?? any input is appreciated.
 
act stage 3 6 puck sprung clutch with havey duty pressure plate. its like $370 shipped from frsports.com right now cause they have free shipping this week.
 
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