B-King engine difference from a Gen 2 engine?

[The Ant]

Hey, just wanting to be explained the exact engine tune difference between the standard B-King engine and the standard Gen 2 Busa engine.

I was told at the Suzuki stand at the Island that his tech blokes says that its just the exhaust which detunes it but I'm lead to believe it's cams etc also.

Also Peter Stevens tells me that the sprockets sizes are the same for both the B-King and Gen 2 Busa, if this is the case how is the B-king suppose to be better at accelerating to about 180kmh than the Gen 2 Busa and how is the B-King limited to a top speed of 150 mph?

Thanks