Yep genuine cefiro rb20dets have most sensors, ignitor, coil pack different to a r32. in fact i've found the ceffy's loom/igniter/coilpacks/airflow meter are same as r31. r31has a 128 bit ecu, r32 has 256.
Coils packs, while still having 3 pins, have the pins facing the opposite way to the r32 coil packs, hard to explain on here, but i've got no idea how you fit the ca (same as r31, and ceffy) coil packs and the r32 ones on the same loom.
sorry to sidetrack simon, doesn't really fix your miss, just a bit of info.
i'd say its a break in a wire somewhere, like you said.
good luck finding it