You have to be kidding so this is a joke right?
If not then look at the info on the Honda site of the two bikes along with the info.
One is a V-twin of 1000cc & the other is a four in line of 600cc. First was designed to be competitive to Ducati V-twin 1000cc bikes in road racing only that is not needed with changes by the FIM. The 600 is the street version of their 600 road racer.