To the best of my knowledge there are 3 different engines (block) available, 1 petrol and 2 DERV (within the UK).
1.4 Petrol (90, 120 & 150 BHP)
1.6 DERV (105 & 120 BHP)
1.9 DERV (120 & 150 BHP)
2.0 DERV (165 BHP)
The 1.6 & 2.0 are the same block, just a different bore. Engines have different power outputs which are turbo and map linked I believe.
I'd assume each engine (3) probably use the same gearbox, regardless of the power output. I'd also assume that all 1.4 engines use the M32 box based on previous comments, and that the same applies to the 1.9 also, as its the same engine fitted in the Grande Punto Sporting I believe, and these all seem to have M32 boxes.
The question is does the 1.6/2.0 DERV engine also have the M32 box.
Just to add a spanner to the works, the automatic (dualogic) Bravo was only available with the 120 BHP engine, in petrol or DERV. This is 1.4, 1.6 (which I've got) and I assume 1.9 for the earlier Diesel Dualogic's.
Dualogic is basically a hydraulically actuated manual box, so its not impossible for it to be the same gearbox (M32) as the majority of manuals, but the question remains that if this is the same engine, why didn't they offer the Dualogic in all other engine power outputs.
Possibly I'm looking to deep into this, but I doubt its common for many variations