The ECU is the Marelli MIU G4. This snapshot is from the service manual. The same ECU is listed in the owner's manual which also specs the diameter at 38mm.Difficult to find, but I did some digging. It's the same it looks like; Single 38 mm Marelli throttle body vs. the V85TT's 52mm throttle body/7SM2 ECU. Not a feasible swap either as the MIUG3 is ECU & TB combined as most here should know. Very unfortunate.
I jumped through the hoops on their new (corny) web page for the V7-850 PDF; motoguzzi.com/us_EN/models/v7/ -- Attached/below.
Pretty insulting to the historic nod for the model though. Wish they'd stop it.