BTW, absolutely no reason to replace the other engine. Operators routinely used 'miss-matched' young and old engines on the same airplane.
Not sure if this practice is still current - but new aircraft with all-zero-time engines will sometimes have a "convenience" removal after a few hundred hours. A perfectly good low-time engine is pulled for "time (cycle) stagger". This helps insure that two (or more) engines don't encounter a future overnight s/b or AD compliance issue at the same time.
If it's a new fleet, this also can serve as an engine remove/replace training refresher for the hangar crew.