I have a pair of 92 Civic Ex Rear disks I was going to use on my CRX, but found 2 pairs of 91 Integra rear disks at the U-Pull.

Which should I use?

Does it even make a difference? The only difference I could see is that with the Integra you can get parts for a 91 CRX instead of a 92 Civic.

 

The trailing arm bushings are different on the DA arms. Bigger

 

Doesnt matter. Pick the nicer of the two sets and sell the other set to pay for the ones you use.