Between YJ and CJ spings?

I'll make SOA in my CJ, but I like to know if the YJ springs are stronger than the Cj's.

Actually the front springs of my CJ are almost flat and I like stronger springs...
Regards...

http://www.off-road.com/jeep/tech/susp/cjsoa.html

Thank you MacGyver80 and GO VICK'S!!!