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 acquires a prize, and secures a subsequent championship match (for the title, at the time of their choosing) with the condition of having one year to activate their championship match privilege (which involves surrendering the prize - akin to WWE's Money in the Bank briefcase).