Advice - Should I / Can I Use These Hsd Hr Coils On My R34?

[Got Boost?]

Hey all,

I'm not very familiar with suspension components and advatages / disadvantages as far as brands and certain parts go. I have a set of brand new HSD Systems Type HR Coilovers i bought for my R33 GTS-T. My questions are -

A) Can i use them on an R34 GTR? I know the spring rates are different, but will they fit and is it worthwhile over the standard GTR suspension i have now?

B) Will they negatively effect the car from where it is now? keeping in mind i am only planning occasional track days in the near future until i get the funds together for all the upgrades i want to do.

Sorry if that sounds stupid but i'm really confused as to what i should and shouldn't / can and can't do after reading various articeles and reports in magazines and on here.

Thanks all!