Forgot to say, assuming the clutch is correct for your application, I suspect either uses the same throw-out bearing. I figure any minor dimensional difference between clutches would be taken up with the clutch rod adjustment. So you should be good to go.
You might find the new one will feel different than the old when pushing on the clutch pedal, similar to the difference I felt 40+ years ago when the clutch was swapped but I figure nothing really to do with the B&B vs. Belleville basic PP design, more to do with how "stiff" the manufacturer designed your particular units to be. The diaphragm style does have an "over-center" effect inherent in the design, which has the effect of reducing pedal effort when the pedal is depressed, say as you sit at a light with the clutch pedal fully depressed. This is one of the merits of its design.
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