they are prolly manufactured by the same company, and just sold off as a`stock`product and then modified by the company who is selling them. thats how alot of manufacturing works in the bike industry

iv used grass to get to the bottom, works great in a thicker dh tire or tubeless tire because it dosent pack down as badly, just gotta be careful with the thinner xc tires as it also comes down to the problem of shredded tires.