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I wouldn't use higher voltage rated electrolytics than the original specs called for.
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I do not think this is a problem, except to bear in mind that electrolytics gradually adopt the working voltage that they are exposed to so don't go and swap it out into something else without reforming it.
I have just encountered this issue as a design fault of the Farnell E350 PSU. The voltage on the main smoothing is switched with the output ranges. This creates the dangerous problem that if the highest range is not used for many years, and then it is selected the result will not be good.