Handlebars and Gear-Shifters

So i am just about to get a new set of 31.8 handlebars, more specifically the "Crank Brothers Iodine 1 AM Riser Handlebar", but i am unsure if the Shimano SRAM grip-shifts which i have are going to fit on this bar as my current one is a 25.4 bar. are the ends of bars all same diameter or am i going to need to get new shifters?
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