[noun] + とは打って変わって [noun] + とは打って変わり
The expression とは打って変わって (or とは打って変わり) is used to describe a dramatic, complete change from a previous state or situation. It emphasizes that something is strikingly different from what came before or from what was expected. The phrase literally contains うつ打つ (to strike) and かわる変わる (to change), conveying the image of a sharp, sudden transformation.
This is a formal, somewhat literary expression commonly found in written Japanese, news reports, speeches, and narration. It is used when contrasting two time periods, situations, or states.
The pattern attaches to a noun (often representing a previous time, situation, or state) followed by とは打って変わって or とは打って変わり, and then a clause describing the new, contrasting situation.
Both forms are interchangeable in meaning. とはうってかわり打って変わり is slightly more formal and literary, while とはうってかわって打って変わって is the standard て-form continuation and is more common overall.
This expression is not used for minor or gradual differences. It specifically conveys that the change is dramatic and unmistakable. It is stronger than expressions like 〜~とちがって違って or 〜~にくらべて比べて, which can describe any degree of difference.