It will eventually work but will not simply bolt together. Your forced to use the Integra cat as the B-series exhaust flange is angled differently (Bseries - /, Dseries - \). You can cut the flange off the D-series cat and reweld it to the proper orientation or just use the B-series cat. Here's a picture of the cat I used on my '92 CX/'95 B18C1 swap.



Your's won't have the hole on the left side (the GS-R exhaust manifold puts the O2 sensor in the cat before the actual catalyist material, I think all other B-series manifolds just have longer exhaust downpipes and shorter cats) and you can see in the pictures the extension I had a local muffler shop make me that allowed everything to bolt up. It only cost me about $30 and I just used some wire to tie everything up and drove the car open header (well, open cat) straight to the place and got it fixed. You may have a different lenght gap to fix as the different B-series manifolds tend to terminate in different locations. I had a testpipe / straight pipe fabricated before but it really affected the sound of the exhaust (real high pitched and whinney) so I went back to the cat.