Hi Allan. You're probably right. I looked on my own Cloverleaf 24V and the relays don't come off. I checked the Alfa ePER system and found the following for the 2 cars involved here:
24V Cloverleaf: ABS Pump and ECU unit part number : 5895520; Compatability M1 ,M2 ,M3 ,M4 ,M5 ,M8 ,M9. Relay part number : 9950678. ECU part number : 9947456.
24V Super: ABS Pump and ECU unit part number: 60568235 or 46405397; Compatability M1 ,M2 ,M3 ,M4 ,M5 ,M6 ,M7. Relay part number : 9950678. ECU part number : 9947456.
So the electrical bits are the same (in terms of Alfa part numbers) but the pump assembly number is different, however since both cars involved are M4 and the pumps are M4 compatible I imagine that a swap should be possible. The interesting thing is that all 3 complete pump units have the same Bosch part number on them despite the fact that the ECU parts (in terms of "fixed" or "removable" relays) are different... I guess that should convince me that a swap is allowed!
I'll set about the task tomorrow and aim to be done for the weekend, weather permitting....
All the best!
Duncan