I don't know for certain - I expect if it does fit the rations will be different. I was told that the Multi gearbox is the same as the Alfa 147 one, so it sounds plausible.
Maybe...fiat group shares many parts but i cant see it to be a straight fit...if is a straight fit i want the 3.2 6speed gta gearbox on my multipla...oviously with the 3.2 engine attached to it!!!