Not if you follow the logic of normal bolters in DH, where they fire the same ammo and thus have identical damage. Bolt pistols do 1D10+5X Pen 4, bolters do 1D10+5X pen 4. Thus, astartes bolters should do the same thing, 2d10X pen 5 etc. Only the heavy bolter is different, but I'm wondering if the heavy bolter is the same for marines as guard.
Hellebore