I don't know a ton about clutches. I do know that the Exedy Hypersingle I had at one point only worked with the matching flywheel, because it was a single puck on a smaller diameter flywheel. After I killed that and was unable to replace it in pieces, I decided to go with the ACT stuff because of its OEM compatibility.
However, I've got an '04 6MT in my WRX, so I've only needed the STi specific bits and I'm not sure what crossover compatibility there is between the STi and WRX for clutches, but I'd be willing to guess they're interchangeable, simply because I can't see why they wouldn't be. But that doesn't make it true... hopefully someone w/ more knowledge can chime in.
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