The BCARs of the day had a quite different treatment, but the results were pretty much the same.
My imprecise recollection was that the BCARs had a requirement for 20kt accountability, although that may have been seen in the end AFM rather than the Design Standard specifically - until such time as I can dig through the archives, I am not able to resolve the problem.
Might you be able to cite those aspects of the BCAR which represented a "quite different treatment" to help reconcile the ageing memory ?