Most, but not all, of the collections that can be collected for both playback and SSR run as independent collections. So even if the schedules have the same interval the time at which they are collected is most likely going to be different. There are a just a few collections, such as Deadlock List, where the data collected for playback is copied into the SSR. That is because for those collections a separate data collection won't work or is too much overhead.
The reason for the separate schedules is that the SSR is generally considered to be for long term trends so the SSR collections usually have much longer schedule intervals.
