Spring Rates: FRONT/REAR
Yes, a 93-95 SOHC wagon had stiffer springs than a DOHC wagon.
For 96-01 Wagon's only, DOHC rear springs have more preload than SOHC's in this gen, making them the stiffest stock rear spring ever available on a satty.
For all years, an air conditioned car's front spring's will have more preload in them, making them stiffer than non-air conditioned cars. SOHC's and DOHC's use the same front springs, the only difference is AC.
All this information courtesy of Moog/Federal Mogul's website.
https://mfr.activant.com/mfrserv/extsrv ... er=FMOFull
Aftermarket drop coil spring rates, FRONT/REAR (lb/in):
Dropzones (coilovers) 450/350
H&R Race Springs: 310/250
H&R Sport Springs: 205/195
Eibach Pro Kit: 149/91-159
Progress Group: 200/170
Sprint 2" Springs: 200/140
Sprint 2.5" Springs: 200/140
KYB GR-2 front: 30% stiffer than stock KYB GR-2 rear: same as stock