I think you need to measure the "hat" of the rotor.. Lay both rotors flat, touching and look level with them. Is one higher?? if so, you may have to shim either the rotor or the caliper.
I stripped the front brakes (rotors, calipers) from a gsr and have had them sitting til I got this 90 civ 4dr.
If the distance is the same from your 90-94 DA, then you should just be able to bolt on and go. I do remember that the GSR rotors were sligthly larger than say a 89-91 Prelude si.. The spacing was too great so I never swapped them.
Later this week I'll try and bolt up the gsr stuff to my 90civ and see if the bolt holes for the calipers will lign up or not.
Your geometry should be OK if you just stay with swapping the brake parts.
E