Sidi sizing

Hi, I'm looking at a pair of Sidi mtb shoes. Probably cape or maybe dragon. How do sidi's sizes compare to diadora? I wear a 43.5 in diadora, the only cycling shoes I've had. These fit me great. Do sidi's match sizing of diadora or are they slightly different. Traditionally I'm a UK9 in normal shoes.
Thanks.
Thanks.
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Peter