Can we always use interchangeably "Die" or "Sie" in the case of referring to 3rd person plural either in written language and spoken language?
Die haben einfach ihre Fotos auf das Auto geklebt. Sie haben einfach ihre Fotos auf das Auto geklebt.
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No. Almost never. Sie is a personal pronoun, while die is either an article or a demonstrative pronoun. There are some simple cases where both a personal pronoun or a demonstrative pronoun can be used but there is a change in meaning:
Sie stehen dort hinten.
They are standing over there.
Die stehen dort hinten.
Those are standing over there.