The classico used the CFC201F gearbox ECU hardware, and from 04 onwards the CFC231F gearbox ECU hardware was used.
This followed at the same time with the Ferrari 360 that used the same gearbox/cambiocorsa configuration, and the same gearbox ECU's.
As we know Ferrari's are much more common, and consequently more people have looked into the different gearbox ECU's.
From what I can make out the CFC201F and CFC231F are interchangeable, the difference being the 231 has double the EEPROM memory size of the 201. They certainly swop in the CFC231F instead of a CFC201F on 360's, straight plugin swop apparently so they can have a later gearbox map on an early car.
The cheeky Ferrari owners actually buy our 'cheaper' second hand Maserati 231 gearbox ecu's, being the same hardware, to flash on the Challenge Stradale gearbox map!
So, I can't see why the early classico, especially if flashed to the no return softer map, can't be exchanged for the later 231 hardware, with the latest GS map...