It isn't simple, like a resistor. It has to do with the ESR of the capacitor and the leakage current. It is possible that one cap gets a majority of the voltage. So if you are using caps that are rated as high as the replacement, then you won't have a problem.
To get a high rating with serial caps, you need to parallel resistors with the caps to balance out current. These should cause a few times the leakage current of the cap.