"The 3.2/3.3 share the same rod bolts. Neither the SC nor the 964 used those undersized rod bolts"
Only partly right. The SC uses the 10mm bolts that were used on earlier engines as well.
10mm Connecting Rod Bolt Set - Pro Wave ARP 2000 Complete - 1972-1973 Porsche 911 2.4L - 1974-1983 Porsche 911 2.7L / 3.0L - 1976-1977 Porsche 930 3.0L TURBO - ARP -
The 964 uses the same bolt and rod as 3.2/3.3 engines. 964 rod.
ARP Pro Wave 2000 Engine Connecting Rod Bolt Set - 9mm - (1984-1998) Porsche 911 3.2L 964 / 993 3.6L - (1978-1998) 911 Turbo 3.3L 3.6L Turbo - ARP
The 993 uses the same bolt but the rods are different. 993 rod.
The smaller 9mm bolts are not as strong as the earlier 10mm. Upgrading to higher strength bolts for these engines using 9mm bolts is highly recommended.
john