The fronts will also have more coils and are the same diameter top to bottom. The rears have the pigtailed last coil.
I have never had to use a compressor for fixed rate springs. I have used "C" springs, Steedas, MAC's, Jamex etc. Variable rate will require a compressor and are quite a bit more of a pain to install. I can install a set of fixed rate springs in about an hour and a half. The Eibach pro-kit springs in my 90 took me the better part of a day trying to get the compressor to cooperate. Rears never take more than about 15-20 minutes and wont require a compressor but a prybar is sometimes handy.