Hello, Nocteliv—and welcome to English Forums. Nocteliv can the prepositions "in" and "within" be interchangeably used in both sentences, and why? Yes.
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Noctelivcan the prepositions "in" and "within" be interchangeably used in both sentences, and why?Yes. Why do you think they may not?
Noctelivthe two prepositions shouldn't be interchangeableGenerally, synonyms are interchangeable in certain contexts (as with yours), but of course not always.
Noctelivt 'in' was generally used when referring to locations while 'within' was associated with limits or deadlinesThat sounds like a reasonable guideline, though