Yeah, get at least the same voltage rating unless you know the originals were spec'd marginally.
When I was recapping an amp of a different brand I found the capacitance rating needed for some was only available in voltage two or three steps higher. Point being, don't be afraid to use higher voltage but as noted by Ths364, check the size information to see how they'll fit.
In some cases you may even want to go up a step or two or three just to get a better fit for lead spacing. The new caps can be quite a bit smaller in the same ratings.