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The only place to check would be the individual vender websites. We always recommend using at least a post deployment reboot.
Have your ever run an update manually and gotten a popup that certain programs need to be closed or else you'll have to reboot after the update? If a system is in such as state when vCenter runs patches silently, the user will generally not be notified. So the state of the system when patches run may influence the need for a reboot as much as the patch itself.