Advice Needed Re: Cranksets

I have a Giant Defy with triple shifters for a FSA Tempo triple crankset. I had to recently change the FD to a Shimano Claris one as my one had failed. I now want to change the crankset from the current 52/42/30 one.

I found a Claris one on Evans Cycles at 50/39/30 and asked them the question could I swap it out, the answer I got in reply was NO. Can anyone tell me why as I don’t fully understand why this can’t be done. I intend to change the shifters to newer triple ones shortly and could also change the RD if necessary.

Thanks in advance from a newbie.

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