No. ToB is different. It is a continuation of the stroy. So you finish SoA first, then only you go to ToB. Once you get to ToB, you cannot go back to SoA.
There is only one area that is an exception that you can play aytime during SoA or ToB. That is the Watcher's Keep. However, it is recommended that this area be played during ToB (at the beginning of ToB), after finishing SoA.
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