http://homepage.ntlworld.com/tbroom/Turbos.htm
those are the numbers
32Nismo (14411-06U00)
BNR34 (14411-AA300)
34N1 (14411-AA401)
34N1 (14411-AA402)
34N1 (14411-AA403)
better yet more xpensive since it have an automatic setting, so beside just the diode light and knobs there is actually a controller.
http://www.full-race.com/store/r14-awd-skyline/ets-pro-center-diff-torque-split-controller-for-r32-r33-r34-skyline-gt-r-1.html
that might be just the feeling, if there was actual numbers or a test done to see the difference. The thing is that human sensation can hinder the actual result even if it was a blind test, maybe a race car driver can tell. IDK.