I don't think they are the same. I believe that the 90-91 CRX SI and RT4wd had 9.5" brakes (just like every other civic/crx except the EX) but had larger brake pads than all the other civic brakes. They will still probably bolt on, but you would need to use the pads for the applicable calipers. I'm not 100% sure so you may be best waiting for someone else to chime in.
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...short answer, haha.