300 ex 01 raptor shock swap

I was wondering if any one that has done 01 raptor shock swap could tell me the difference between the white spring or the yellow I have found a few shocks on ebay just want to get the right one do to the fact I am a bigger guy. Also do I need the remote reservoir or can buy the one with the reservoir attached to the shock ? Many thanks in advance just trying to get my 300ex going