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I agree with @mali that the data will not be synchronized.
For synchronizing data by timestamp (essentially @mali s suggestion), there is the message_filters package which offers a TimeSynchronizer and an ApproximateTimePolicy to sync incoming topics by timestamps. Which one you choose depends a little bit on the kind of data you expact.
(Without more details about your setup, I can only guess: TimeSynchronizer seems reasonable for the second node, if required, as I guess it should act on the topics published from the first node simultaneously, for the third node the ApproximateTimePolicy makes most sense, I guess)
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