While buying a used ECM has risk, the price difference between one and even a reco. one makes it an attractive option.
The 1227808 ECM was used in:
LD Holden Astra, 1.6 and 1.8
N13 Nissan Pulsar, 1.6 and 1.8
JD unleaded (TBI) Camira
JE Camira
VN, VP, VQ, VG V6 and V8
There are plenty around, just swap in your MemCal - 2 mins work.
You want a good reason, e.g. suspect a fault with it, to replace the MemCal as there are many variations in the tunes even within ostensibly the same model. This is why I suggested that you keep your current MemCal in the other thread. Otherwise, match the model number on the MemCal, visible on the sticker on the IC.
As a diagnostic step, running any MemCal appropriate to the engine (Series II V6) that you have will work, even an auto. one in the manual. That may however result in some drivability issues, mostly around idle conditions.