The Call Your Shot winner receives a trophy, and earns a future championship match (for the title, and at the time, of their choosing) with the stipulation of having one year to invoke their championship match privilege (which is done by handing in the trophy to an official - similar to WWE's Money in the Bank briefcase).
The Call Your Shot winner secures a trophy and gains access to a future championship match for the title. They must activate this right by returning the trophy to an official within one year, which is similar to how WWE uses the Money in the Bank briefcase.