It's obvious that something changes. Without having the hardware to inspect and measure everything, I'd not make any assumptions about what's changing.
Contact the brake's maker or, if it came with the rifle, the rifle maker, then ask them about it. If they don't have any idea, then I'd take the hardware back to its seller and get a refund.
US Navy Distinguished Marksman Badge 153
Former US Navy & Palma Rifle Team Member
NRA High Power Master & Long Range High Master
NRA Smallbore Prone Master