High moisture kit vs. silage special round balers

Hey folks,

  Does anyone know whether a high moisture "kit" for a round baler, like on a John Deere 449, makes it as capable with silage/haylage/baleage as an actual Silage Special machine like the 459ss, etc.? I think the kit adds the scraper and the spiral roller, but I can't tell whether a silage special baler is just built burlier to handle green hay.

  I'm wondering because apparently a NH "high moisture" baler like the BR7050 can only handle hay at around 35% moisture, while the NH silage special balers can supposedly handle up to 60%.

  Thanks.

  

High moisture kit vs. silage special round balers